Pagkugi

Preview site. This site is a preview: the hosted download is not connected yet. The project itself is real.

Compare

Every client, every feature

The detailed comparison. Each table covers one area; every client is a row and every feature in that area is a column. A client name opens its profile, where the same comparison is shown against Pagkugi.

Storage and ownership

Where the mail actually lives, and whether it survives the client.

Client Open local storage Maildir as the live store Works offline
Pagkugi Yes Yes Yes
Thunderbird Optional Maildir is supported; mbox is the default. Optional Yes
Apple Mail No No Yes
Outlook No No Limited Recent mail only in the new Outlook.
Gmail No No Limited
Sylpheed Yes One message per file in its own layout. No Yes
Claws Mail Yes Yes Yes
Geary No No Yes
Pegasus Mail No No Yes
Proton Mail No No Limited
Fastmail No No Limited
RainLoop No No No
Open-Xchange No No No
Mutt/NeoMutt Yes Yes Yes
aerc Yes Yes Yes
mu4e Yes Yes Yes
Gnus Yes Limited Yes Agent.
Wanderlust Yes Yes Yes
Alpine Limited Mail collections; Maildir through patches. Limited Through patches. Yes
Himalaya Yes Yes Yes
Notmuch Yes Yes Yes
mblaze Yes Yes Yes
Eudora Limited Its own inspectable but proprietary store. No Yes
Penguin Mail No No Limited Recent mail and the inbox are cached; older mail is fetched on demand.
Pelton No No Yes
MailVault Yes Plain .eml in a Maildir-style tree. Yes The vault is Maildir-style; the provider remains the server. Yes
Skim No No Yes
Mailspring No No Yes
Marco No No Yes
Epist No No Yes
neomd No No No
notmutt Yes Yes Yes
BAREmail No No Yes
Sterna Mail No No Yes
Zero No No No
MailFlow No No No
Evolution Optional Local mail store; Maildir and mbox are available. Optional Maildir and mbox are account-configured. Yes
Betterbird Optional Maildir is supported; mbox is the default. Optional Yes
K-9 Mail No No Yes
Mimestream No No Limited Local cache; the Gmail API remains the source.
Superhuman No No Limited
Shortwave No No Limited
Spark Mail No No Limited
Canary Mail No No Limited
eM Client No No Yes
Mailbird No No Yes
FairEmail No No Yes
HEY No No Limited
Notion Mail No No No
Skiff Mail No No Limited
Postbox No No Yes
Balsa Yes Local mailboxes in Maildir and mbox. Yes Yes
Citadel No No No
Cypht No No No
Horde IMP No No No
KMail Yes Yes Yes
Mailpile No No Limited
meli Yes Yes Yes
Mew Yes Optional MH folders; Maildir through configuration. Yes
nmh Yes MH message files. No Yes
Roundcube No No No
SnappyMail No No No
SOGo No No No
SquirrelMail No No No
VM (ViewMail) Yes UNIX mailbox and BABYL folders. No Yes
Aerion No No Yes
Alps No No No
Matcha No No Limited
Zimbra No No No
Velo No No Yes
Mainly No No No
Sup Yes Yes Yes
Flectar Mail No No Yes
Jobbox No No Yes
DispatchMail No No No
Clova No No No
Talanoa No No No
Tallyman No No No
Omnia No No No
Stillmail No No No
GotEmail No No No
Busymail No No No
Mocca No No No
Hadavar No No No
WMail No No No
MailDeskt No No No
Clutterstrike No No No
Cwmail No No No
Faraday No No No
Airmail No No No
Edison Mail No No No
Missive No No No
MailMate No No No
The Bat! No No No
BlueMail No No No
Aqua Mail No No No
Newton No No No
Polymail No No No
Nylas Mail No No No

Accounts and protocols

The servers and providers the client can talk to.

Client IMAP and SMTP POP3 Gmail account Microsoft / Exchange JMAP
Pagkugi Yes No Not in the first release. No Provider-specific account model is not supported. No Exchange-specific account model is not supported. No
Thunderbird Yes Yes Yes Yes Exchange support was added in 2025. No
Apple Mail Yes Yes Yes Yes No
Outlook Yes Yes Yes Yes No
Gmail Yes Yes Yes No No
Sylpheed Yes Yes Limited Generic IMAP only. Limited Generic IMAP only. No
Claws Mail Yes Yes Limited Generic IMAP. Limited Generic IMAP. No
Geary Yes No Yes Gmail provider preset. Limited Generic IMAP. No
Pegasus Mail Yes Yes Limited Generic IMAP. Limited Generic IMAP. No
Proton Mail Limited Through Proton Bridge. No Limited Gmail import and sync, not a native Gmail account. No No
Fastmail Yes Yes Yes Limited Yes
RainLoop Yes No Limited Generic IMAP. Limited Generic IMAP. No
Open-Xchange Yes Limited Limited Generic IMAP. Limited Generic IMAP. No
Mutt/NeoMutt Yes Yes Limited User-configured. Limited User-configured. No
aerc Yes No Limited User-configured. Limited User-configured. Yes
mu4e External Sync and send through external tools. External Limited User-configured. Limited User-configured. No
Gnus Yes Yes Limited User-configured. Limited User-configured. No
Wanderlust Yes Yes Limited User-configured. Limited User-configured. No
Alpine Yes Yes Limited User-configured. Limited User-configured. No
Himalaya Yes No Yes Gmail REST. Yes Microsoft Graph. Yes
Notmuch No No No No No
mblaze No No No No No
Eudora Yes Yes Limited Generic IMAP. Limited Generic IMAP. No
Penguin Mail Yes Yes Yes Yes Yes
Pelton Yes No Yes OAuth2 with the user's own client credentials. Limited Through generic IMAP. No
MailVault Yes No Yes OAuth2. Yes Microsoft 365 OAuth2 and Outlook.com Graph. No
Skim Yes No Yes Yes No
Mailspring Yes No Yes Limited No
Marco Yes No Yes Yes No
Epist Yes No Yes OAuth with PKCE. Limited No
neomd Yes No Yes Gmail configuration and OAuth. Yes OAuth. No
notmutt No No No No No
BAREmail No No Yes No No
Sterna Mail Yes No Yes Yes Yes
Zero Limited Provider integrations rather than a generic IMAP desktop core. No Yes Yes No
MailFlow Yes No Yes Yes OAuth2. No
Evolution Yes Yes Yes Through IMAP. Yes Exchange EWS and MAPI plugins. No
Betterbird Yes Yes Yes Yes Inherits Thunderbird's Exchange support. No
K-9 Mail Yes Yes Yes Limited Generic IMAP with OAuth where the provider allows it. No
Mimestream No No Yes No No
Superhuman No No Yes Yes No
Shortwave No No Yes No No
Spark Mail Yes No Yes Yes Exchange and Outlook. No
Canary Mail Yes No Yes Yes Exchange and Outlook. No
eM Client Yes Yes Yes Yes Exchange and Office 365. No
Mailbird Yes No Yes Yes Exchange support is Premium. No
FairEmail Yes Yes Yes Limited Generic IMAP; no Exchange Web Services or ActiveSync. No
HEY No HEY does not offer IMAP; mail is read in HEY or forwarded out. No No No No
Notion Mail No No Yes Gmail accounts. No No
Skiff Mail No No No No No
Postbox Yes Yes Yes Limited No
Balsa Yes Yes Limited Generic IMAP. Limited Generic IMAP. No
Citadel Yes Yes No No No
Cypht Yes No Yes Limited Limited Tracked, not core.
Horde IMP Yes No Yes Limited No
KMail Yes Yes Yes Limited No
Mailpile Yes No Yes No No
meli Yes No Limited Limited Yes
Mew Yes Yes Limited Limited No
nmh No No No No No
Roundcube Yes No Yes Limited No
SnappyMail Yes No Yes Limited No
SOGo Yes No Yes Limited No
SquirrelMail Yes No Yes Limited No
VM (ViewMail) Yes Yes Limited Limited No
Aerion Yes No Yes Yes No
Alps Yes No Yes Limited No
Matcha Yes No Yes Limited No
Zimbra Yes Yes Limited Yes No
Velo Yes No Yes Gmail API. Limited Through IMAP/SMTP. No
Mainly Yes No Yes Limited No
Sup No No No No No
Flectar Mail Yes No Yes Yes Yes
Jobbox Yes No Yes Limited No
DispatchMail Limited Gmail IMAP; not a general SMTP workflow. No Yes No No
Clova Limited Service-specific inboxes; standard IMAP is not the model. No No No No
Talanoa Limited No Limited No No
Tallyman No No Yes Yes No
Omnia No No No No No
Stillmail No No No No No
GotEmail Yes No Yes Yes No
Busymail Yes No No No No
Mocca Yes No Yes Limited No
Hadavar Yes No No No No
WMail No No No No Yes
MailDeskt No No No No No
Clutterstrike No No No No No
Cwmail Yes No No No No
Faraday No No No No No
Airmail Yes Yes Yes Yes No
Edison Mail Yes No Yes Yes No
Missive Yes No Yes Yes No
MailMate Yes No Yes Limited No
The Bat! Yes Yes Yes Limited No
BlueMail Yes Yes Yes Yes No
Aqua Mail Yes Yes Yes Yes No
Newton Yes No Yes Yes No
Polymail Yes No Yes Yes No
Nylas Mail Yes No Yes Yes No

Reading

How a message is presented, and what happens to HTML.

Client In-app HTML rendering HTML converted to text Conversation threading Calendar invitations
Pagkugi No Mail is converted to text instead. Yes Yes Limited A focused read-only viewer, not a calendar application.
Thunderbird Yes Yes Yes Yes
Apple Mail Yes Varies Yes Yes
Outlook Yes Varies Yes Yes
Gmail Yes Varies Yes Yes
Sylpheed Limited An internal parser, with no browser engine. Yes Yes No
Claws Mail Limited Through a viewer plugin, not a bundled browser. Yes Yes Plugin Through a plugin.
Geary Yes Yes Yes No
Pegasus Mail Limited Conservative, without a hosted browser engine. No Yes No
Proton Mail Yes Yes Yes Yes
Fastmail Yes Yes Yes Yes
RainLoop Yes Sanitized, with remote images controlled. Yes Yes No
Open-Xchange Yes Sanitized. Varies Yes Yes
Mutt/NeoMutt No External Through a mailcap handler. Yes External Through external tools.
aerc Limited Terminal HTML browsing. Yes Yes Limited View only.
mu4e Limited Emacs HTML rendering. Yes Yes Limited Through Org and iCalendar tooling.
Gnus Limited Emacs rendering. Yes Yes No
Wanderlust Limited Emacs rendering. Yes Yes No
Alpine No Yes Yes No
Himalaya No Yes Limited Basic. No
Notmuch No No Yes No
mblaze No Yes Yes No
Eudora Yes Sanitized MSHTML. Yes Limited Group by subject. No
Penguin Mail Yes Sandboxed, scripts off, remote images blocked. Yes Yes Yes
Pelton Yes Yes Yes No
MailVault Yes Yes Yes Limited Invitations open externally; no calendar application.
Skim Yes Sanitized, no scripts. No Yes Limited RSVP card; no calendar.
Mailspring Yes Yes Yes Limited
Marco Yes Yes Yes No
Epist Limited Terminal conversion. Yes Yes Yes
neomd Limited Browser view with a CSP. Yes Yes Yes RSVP.
notmutt Yes Terminal HTML, no browser. Yes Yes No
BAREmail No Limited Plain-text reader. No No
Sterna Mail Yes Yes Yes Yes
Zero Yes No Yes Limited
MailFlow Yes Sanitized. Yes Yes Limited
Evolution Yes Yes Yes Yes
Betterbird Yes Yes Yes Yes
K-9 Mail Yes Basic HTML view. Yes Yes Limited Opens .ics attachments; no built-in calendar.
Mimestream Yes Yes Yes Yes Responds to invitations; no calendar application.
Superhuman Yes Varies Yes Yes Superhuman Calendar.
Shortwave Yes Varies Yes Yes Integrated calendar.
Spark Mail Yes Varies Yes Yes
Canary Mail Yes Varies Yes Yes
eM Client Yes Varies Yes Yes
Mailbird Yes Varies Yes Yes Native calendar is Premium.
FairEmail Yes Safe message view. Yes Yes Yes Pro: accept/decline and add to calendar.
HEY Yes Varies Yes Yes HEY Calendar.
Notion Mail Yes Varies Yes Limited
Skiff Mail Yes Yes Yes Yes Skiff Calendar.
Postbox Yes Yes Yes Limited
Balsa Yes Optional WebKit view. Yes Yes Limited
Citadel Yes Yes Yes Yes
Cypht Yes Yes Yes Limited
Horde IMP Yes Yes Yes Yes
KMail Yes Yes Yes Yes
Mailpile Yes Yes Yes No
meli Limited Terminal HTML rendering. Yes Yes Limited
Mew Limited Emacs rendering. Yes Yes Limited
nmh No External Through external tools. Limited No
Roundcube Yes Yes Yes Plugin Through the calendar plugin.
SnappyMail Yes Yes Yes Limited
SOGo Yes Yes Yes Yes
SquirrelMail Limited Yes Yes No
VM (ViewMail) Limited Emacs rendering. Yes Yes No
Aerion Yes Yes Yes Limited Calendar extension is alpha.
Alps Yes Yes Yes Limited CalDAV.
Matcha Limited Yes Yes Limited
Zimbra Yes Yes Yes Yes
Velo Yes Yes Yes No
Mainly Yes Yes Yes Limited
Sup No Yes Yes No
Flectar Mail Yes Own Rust renderer, not a WebView. Yes Yes Yes
Jobbox No Yes Yes No
DispatchMail No Yes Limited No
Clova Yes No Limited No
Talanoa Yes No Yes No
Tallyman Yes No Yes No
Omnia Limited No Yes No
Stillmail Limited No Yes No
GotEmail Yes No Yes No
Busymail Yes No Yes No
Mocca Yes No Yes No
Hadavar Yes No Yes No
WMail Yes No Yes No
MailDeskt Yes No Limited No
Clutterstrike Yes No Limited No
Cwmail No Yes Yes No
Faraday Yes No Yes No
Airmail Yes No Yes Yes
Edison Mail Yes No Yes No
Missive Yes No Yes No
MailMate Yes Yes Yes No
The Bat! Yes No Yes No
BlueMail Yes No Yes No
Aqua Mail Yes No Yes No
Newton Yes No Yes No
Polymail Yes No Yes No
Nylas Mail Yes No Yes No

Writing and organizing

Composition, search, and the tools that shape a mailbox.

Client Rich or HTML composition Snooze or send later Full-text search Custom incoming filters Tags or labels Mailing-list actions Command palette or keyboard-first Open-thread work view
Pagkugi No Composes text/plain; Markdown composition is not released. No Yes No The local filter engine is implemented but switched off. No Read state only; no general labels or tags. Yes No Actions live in explicit context menus. Yes
Thunderbird Yes Limited Available through add-ons. Yes Yes Yes Plugin Through add-ons. Limited Keyboard shortcuts, not a command palette. No
Apple Mail Yes Yes Yes Yes Yes Limited Unsubscribe and rules. Limited Keyboard shortcuts, not a command palette. No
Outlook Yes Yes Yes Yes Yes Limited Rules. Limited Keyboard shortcuts, not a command palette. No
Gmail Yes Yes Yes Yes Yes Labels. Limited Unsubscribe. Limited Keyboard shortcuts, not a command palette. No
Sylpheed No It cannot compose HTML. No Yes Yes Limited Limited Limited Keyboard shortcuts, not a command palette. No
Claws Mail Limited No Yes Yes Yes Plugin Through a plugin. Limited No
Geary Yes No Yes No Limited No Limited No
Pegasus Mail Limited Responsible HTML. No Yes Yes Limited Yes Rule engine. Limited No
Proton Mail Yes Limited Yes Yes Yes Limited Unsubscribe and filters. Limited No
Fastmail Yes Yes Yes Yes Yes Limited Unsubscribe and filters. Limited No
RainLoop Yes No Yes Yes ManageSieve. Limited Plugin Through a plugin. Limited No
Open-Xchange Yes Yes Yes Yes Sieve. Yes Limited Unsubscribe and Sieve. Limited No
Mutt/NeoMutt No No Yes Yes Yes Limited Manual actions. Limited Keyboard-driven, without a palette. No
aerc Limited Terminal editor with filters. No Yes Yes Filters and hooks. Yes Notmuch. Limited Patch and list workflows. Limited Ex-command system. No
mu4e Limited Emacs message mode. No Yes Yes Yes No Yes Emacs M-x. No
Gnus No No Yes Yes Scoring. Yes No Yes Emacs M-x. No
Wanderlust No No Yes Yes Refiling and rules. Yes No Yes Emacs M-x. No
Alpine No No Yes Yes Limited No Limited Menu-driven. No
Himalaya No External composer. No Yes No Yes No Limited CLI commands. No
Notmuch No No Yes No Yes No Limited CLI. No
mblaze Limited Compose utilities. No Limited Grep and sequences. No No No Limited CLI. No
Eudora Yes No Yes Yes Yes No No No
Penguin Mail Yes Yes Remind Me and Send Later. Yes Yes Gmail filters, Microsoft rules, and Sieve. Yes Labels. No Limited Keyboard shortcuts, not a command palette. No
Pelton Yes Yes Yes No Yes Eight flag colors. No Yes No
MailVault Yes Yes Yes SQLite FTS5 with trigram and CJK indexes. Yes Auto Tags. Yes No Limited Keyboard shortcuts, not a command palette. No
Skim Yes No Yes SQLite FTS5. No No No Yes No
Mailspring Yes Yes Yes Yes Yes No Limited No
Marco Yes Yes Yes Yes Yes Labels. No Limited No
Epist Limited No Yes No Yes Gmail labels. No Yes No
neomd No Yes Send later. Yes Yes Screener. Yes IMAP keywords. No Yes Keyboard-first. No
notmutt No No Yes Yes Yes No Yes No
BAREmail No No Yes Gmail search syntax. No Limited Star and labels. No No No
Sterna Mail Yes Yes Yes Yes Sieve and vacation. Limited No Limited No
Zero Yes Limited Yes Yes Yes No Limited No
MailFlow Yes Yes Yes Yes Yes No Yes No
Evolution Yes Limited Send later through the Outbox; no snooze. Yes Yes Yes Labels. Yes Limited Keyboard shortcuts, not a palette. No
Betterbird Yes Limited Through Thunderbird add-ons. Yes Adds regular-expression and diacritic-insensitive search. Yes Yes Plugin Through add-ons. Limited Keyboard shortcuts, not a palette. No
K-9 Mail Limited Basic rich text; plain text is the default. No Yes No Limited Stars and flags. No Limited Keyboard shortcuts. No
Mimestream Yes Yes Snooze Labs. Yes Gmail search. Yes Gmail filters. Yes Labels. Limited Gmail filters and labels; no list-specific actions. Limited Keyboard shortcuts, not a palette. No
Superhuman Yes Yes Yes Yes Split Inbox and Auto Labels. Yes Labels. Limited Yes Keyboard-first. No
Shortwave Yes Yes Yes Yes AI filters. Yes Labels. Limited Unsubscribe and block. Yes No
Spark Mail Yes Yes Yes Yes Smart Inbox and Gatekeeper. Limited Limited Unsubscribe. Limited No
Canary Mail Yes Yes Yes Limited Categories and cleanup; not a full rule engine. Yes Labels. Limited Unsubscribe. Limited No
eM Client Yes Yes Yes Yes Rules. Yes Categories. Limited Limited Quick actions. No
Mailbird Yes Yes Yes Yes Filters and rules are Premium. Limited Limited Quick unsubscribe. Limited Keyboard shortcuts. No
FairEmail Limited Basic rich text; plain text is the default. Yes Pro. Yes Pro search indexing. Yes Pro filter rules. Yes Colored stars and keywords. Limited Limited No
HEY Yes Yes Reply Later and Bubble Up. Yes Limited Screener and Bundles, not a general rule engine. Limited Limited Unsubscribe and The Feed. Limited Keyboard shortcuts, not a palette. Limited Reply Later and Set Aside, not a thread work view.
Notion Mail Yes Limited Yes Yes AI labels and views. Yes Labels. No Limited No
Skiff Mail Yes Limited Yes Limited Yes Labels. No Limited No
Postbox Yes Yes Yes Yes Yes Limited Limited No
Balsa Yes No Yes Yes Limited Limited Limited No
Citadel Yes No Yes Yes Limited Yes Limited No
Cypht Yes No Yes Limited Limited Limited Limited No
Horde IMP Yes No Yes Yes Sieve through Ingo. Limited Limited Limited No
KMail Yes Limited Send later and reminders. Yes Yes Yes Yes Limited No
Mailpile Yes No Yes Yes Rules and Bayesian classification. Yes Limited Limited No
meli Limited No Yes Yes Yes Limited Limited No
Mew Limited No Yes Yes Limited No Yes Emacs M-x. No
nmh Limited No Limited Pick and grep. Yes No No Limited CLI. No
Roundcube Yes No Yes Plugin Sieve through a plugin. Yes Limited Limited No
SnappyMail Yes No Yes Yes Sieve. Limited Limited Limited No
SOGo Yes No Yes Yes Sieve. Limited Limited Limited No
SquirrelMail Limited No Yes Plugin Filters plugin. Limited No Limited No
VM (ViewMail) Limited No Yes Limited Limited No Yes Emacs M-x. No
Aerion Yes No Yes No Limited No Limited No
Alps Yes No Yes Limited Limited No Limited No
Matcha Limited No Yes Limited Limited No Limited No
Zimbra Yes No Yes Yes Yes Limited Limited No
Velo Yes Yes Yes Yes Yes Labels. No Yes No
Mainly Yes Yes Yes Limited Yes Labels. No Yes No
Sup No No Yes Yes Yes No Limited No
Flectar Mail Yes No Yes No Yes No No No
Jobbox No No Yes Yes Local scoring. Yes Board columns. No No No
DispatchMail Limited AI drafts. No No Yes Whitelist and AI rules. Yes AI labels. No No No
Clova Yes No No No Yes Inboxes and prefixes. No No No
Talanoa Yes No Yes Limited Yes Kanban columns. No No No
Tallyman Yes Limited Yes No Limited No Yes No
Omnia No No Yes Yes Trusted senders. No No No No
Stillmail Limited No Limited No No No No No
GotEmail Yes No Yes No No No No No
Busymail No No Yes No No No No No
Mocca No No Yes No No No No No
Hadavar No No Yes No No No Yes No
WMail Yes No Yes No No No No No
MailDeskt Yes No Yes No No No No No
Clutterstrike No No No No No No No No
Cwmail No No Yes No No No Limited No
Faraday No No Yes Yes Yes No No No
Airmail Yes Yes Yes Yes Yes No Limited No
Edison Mail Yes Yes Yes No Yes No No No
Missive Yes No Yes No Yes No Limited No
MailMate Yes No Yes Yes Yes No Limited No
The Bat! Yes No Yes Yes Yes No No No
BlueMail Yes Yes Yes No Yes No No No
Aqua Mail Yes Yes Yes No Yes No No No
Newton Yes Yes Yes No Yes No No No
Polymail Yes Yes Yes No Yes No No No
Nylas Mail Yes No Yes No Yes No No No

Security and privacy

Encryption, sender checks, and what leaves the machine.

Client PGP / S/MIME Phishing or sender checks Remote content blocked Built-in AI features
Pagkugi No Not built in. Yes Yes No No assistant, by design.
Thunderbird Yes Yes Yes Limited Through add-ons, not the core client.
Apple Mail Limited S/MIME is built in; PGP needs add-ons. Limited Yes Limited Apple Intelligence on newer devices.
Outlook Yes S/MIME is built in; PGP is limited. Yes Yes Yes Copilot.
Gmail Limited Google's end-to-end encryption is not PGP/S/MIME. Yes Yes Yes Gemini.
Sylpheed Yes GnuPG integration. Limited Limited No
Claws Mail Plugin GnuPG plugin. Limited Limited No
Geary No No No No
Pegasus Mail Plugin Plugin. Limited Yes No
Proton Mail Yes Native encryption model. Yes Yes Limited
Fastmail No Yes Yes Limited
RainLoop Plugin Plugin. Limited Yes No
Open-Xchange Yes OX Guard. Yes Yes Yes
Mutt/NeoMutt Yes Through GnuPG. Limited External Depends on the viewer. No
aerc Yes GnuPG. Limited Yes No
mu4e Yes EasyPG. Limited Limited No
Gnus Yes Limited Limited No
Wanderlust Yes Limited Limited No
Alpine Limited S/MIME builds. Limited Limited No
Himalaya Yes External. No No No
Notmuch No No No No
mblaze External Through external tools. No No No
Eudora Plugin Plugin. Limited ScamWatch. Yes No
Penguin Mail Yes Limited Yes Yes Optional assistant.
Pelton Yes Yes Yes No
MailVault No Yes SPF, DKIM, DMARC, and link safety. Yes Yes Local AI writing help.
Skim No Limited Yes Yes Bring your own key.
Mailspring Limited Through plugins. Limited Yes No
Marco No Limited Yes No
Epist No Limited Limited No
neomd No Limited The screener also acts as a phishing defense. Yes Spy pixels stripped. Limited Editor handoff, no built-in model.
notmutt No Limited Yes Limited Metadata-only MCP and CRM workflows.
BAREmail No No Yes Plain-text reader. No
Sterna Mail Yes Limited Yes No
Zero No Limited Yes Yes
MailFlow No Yes Yes Yes
Evolution Yes S/MIME and PGP through Seahorse. Limited Yes No
Betterbird Yes Yes Yes Limited Through add-ons.
K-9 Mail Yes OpenPGP through OpenKeychain. Limited Yes No
Mimestream No Limited Tracking prevention; no PGP. Yes Tracker prevention. No
Superhuman No Limited Limited Yes AI agents, Auto Drafts, and summaries.
Shortwave No Limited Yes Yes
Spark Mail No Limited Yes Yes
Canary Mail Yes PGP and SecureSend. Yes Security and human-error warnings. Yes Yes AI Copilot.
eM Client Yes PGP and S/MIME. Limited Yes Yes AI Assistant and AI rules.
Mailbird No Limited Yes Privacy Hub blocks trackers and remote images. Yes Bring-your-own AI through MCP; opt-in.
FairEmail Yes OpenPGP and S/MIME. Yes Reformats messages and warns about unauthenticated mail. Yes No
HEY No Yes Spam filters and the Screener. Yes Spy-pixel blocker. Yes HEY AI agents.
Notion Mail No Limited Yes Yes
Skiff Mail No Limited Yes No
Postbox No Limited Yes No
Balsa Yes GnuPG through gpgme. Limited Limited No
Citadel No Limited Limited No
Cypht Limited Limited Yes No
Horde IMP Yes Limited Yes No
KMail Yes GnuPG. Limited Yes No
Mailpile Yes Limited Yes No
meli Yes GPGME. Limited Yes No
Mew Yes EasyPG. Limited Limited No
nmh Limited External. No No No
Roundcube Plugin Enigma plugin. Limited Yes No
SnappyMail Yes Limited Yes No
SOGo No Limited Yes No
SquirrelMail Plugin Limited Limited No
VM (ViewMail) Limited External. Limited Limited No
Aerion Yes PGP and S/MIME. Limited Yes No
Alps No Limited Yes No
Matcha No Limited Yes No
Zimbra Limited Limited Yes No
Velo No Limited Yes Yes Bring your own provider.
Mainly No Limited Yes No
Sup Limited External. No No No
Flectar Mail Yes Desktop OpenPGP through GnuPG. Limited Yes No
Jobbox No Limited Yes No
DispatchMail No No No Yes
Clova No Yes Unexpected senders are bounced. Limited Yes Bring your own AI through MCP.
Talanoa No No No No
Tallyman No No No No
Omnia No Yes Separates untrusted mail. Yes No Deliberately excluded.
Stillmail No No Yes No
GotEmail No No Yes Yes On demand.
Busymail No No Yes Yes MCP server.
Mocca No No Yes Yes Bundled local model.
Hadavar No No No Yes
WMail No No No No
MailDeskt No No No No
Clutterstrike No Yes Yes No
Cwmail No No No Yes
Faraday No No No Yes
Airmail No No No No
Edison Mail No No No Yes
Missive No No No Limited
MailMate Yes No No No
The Bat! Yes No No No
BlueMail No No No Yes
Aqua Mail Limited No No No
Newton No No No No
Polymail No No No No
Nylas Mail No No No No

Platform and business

Where it runs, how it extends, and how it is sold.

Client Graphical desktop app Terminal interface Mobile app Web or self-hosted Calendar, contacts, or groupware Plugin or extension system Open source No account with its maker
Pagkugi Yes No No No No No No Proprietary commercial software. Yes
Thunderbird Yes No Yes No Yes Yes Yes Yes
Apple Mail Yes No Yes No Yes Limited Mail extensions. No Yes
Outlook Yes No Yes Yes Yes Yes No No A Microsoft account is required.
Gmail No No Yes Yes Yes Yes Add-ons. No No A Google account is required.
Sylpheed Yes No No No No Yes Yes Yes
Claws Mail Yes No No No Limited Address book. Yes Yes Yes
Geary Yes No No No No No Yes Yes
Pegasus Mail Yes No No No No Yes No Yes
Proton Mail Yes No Yes Yes Yes No Limited Clients are open source; the service is not. No A Proton account is required.
Fastmail Yes Desktop app. No Yes Yes Yes No No No A Fastmail account is required.
RainLoop No No Yes Responsive layout. Yes Limited Address book. Yes Yes Yes
Open-Xchange No No Yes Yes Yes Yes No No An operator account is required.
Mutt/NeoMutt No Yes No No No Limited External helpers. Yes Yes
aerc No Yes No No No Limited Filters. Yes Yes
mu4e No Yes Emacs. No No Limited Org. Yes Emacs packages. Yes Yes
Gnus No Yes Emacs. No No Limited News and calendar integrations. Yes Emacs packages. Yes Yes
Wanderlust No Yes Emacs. No No Limited Yes Emacs packages. Yes Yes
Alpine No Yes No No Limited Address book. Limited Mailcap handlers. Yes Yes
Himalaya No Yes No No No No Yes Yes
Notmuch No Limited Through front ends. No No No Limited Front ends. Yes Yes
mblaze No Yes CLI. No No No No Yes Yes
Eudora Yes No No No No Yes No Yes
Penguin Mail Yes No No No Yes Calendar and contacts. Limited Assistant skills and MCP servers. Yes Yes
Pelton Yes No No No Limited CardDAV contacts. Limited Themes. Yes Yes
MailVault Yes No No No Limited Contacts. No Yes Public source; check the repository license. Yes
Skim Yes No No No No No Yes Yes
Mailspring Yes No No No Limited Contacts. Yes Yes The UI is open source. Yes
Marco Yes No Yes Yes Limited Tasks. No No No A Marco account is required.
Epist No Yes No No Limited Calendar invites. No Yes Yes
neomd No Yes Limited Through Termux. No No No Yes Yes
notmutt No Yes No No No Limited Lua behind a build tag. Yes Yes
BAREmail Yes PWA. No Yes PWA. Yes No No Yes Yes
Sterna Mail No No Yes No Limited Calendar invites. No Yes Yes
Zero No No Limited Responsive web. Yes Limited No Yes No A self-hosted account is required.
MailFlow Limited Electron wrappers in progress. No Limited Capacitor wrapper in progress. Yes Limited CardDAV contacts. Yes Yes No A MailFlow account is required.
Evolution Yes No No No Yes Mail, calendar, contacts, tasks, and memos. Yes Extensions. Yes Yes
Betterbird Yes No No No Yes Calendar and contacts. Yes Thunderbird add-ons. Yes Yes
K-9 Mail No No Yes No No Limited OpenKeychain integration, not a general plugin system. Yes Yes
Mimestream Yes No No No Limited Calendar invitation responses. No No No
Superhuman Yes No Yes Yes Yes Calendar and docs. Limited Agents and connectors. No No
Shortwave Yes No Yes Yes Yes Integrated calendar. Limited Integrations and Tasklet. No No
Spark Mail Yes No Yes No Yes Calendar and team collaboration. Limited Integrations. No No
Canary Mail Yes No Yes No Yes Calendar. No No No
eM Client Yes No Yes No Yes Calendar, tasks, contacts, notes, and chat. Limited Add-ons. No Yes
Mailbird Yes No Yes Public beta. No Yes Calendar and contacts are Premium. Yes 45+ integrations. No Yes
FairEmail No No Yes No Limited Calendar invitations. Limited OpenKeychain integration. Yes Yes
HEY No Yes HEY TUI. Yes Yes Yes Calendar, contacts, notes, and workflows. Limited AI agents and CLI. No No
Notion Mail No No No Yes Limited Notion workspace integration. No No No
Skiff Mail Yes No Yes Yes Yes Calendar, drive, and pages. No Yes Clients were open source; the service was not. No
Postbox Yes No No No Limited Limited No Yes
Balsa Yes No No No Limited Address book. Limited Yes Yes
Citadel No Limited Text-mode BBS client. No Yes Yes Calendar, contacts, tasks, notes, and rooms. Limited Yes No
Cypht No No No Yes Limited Yes Yes No
Horde IMP No No No Yes Yes Calendar, contacts, tasks, and notes. Yes Yes No
KMail Yes No No No Yes Kontact calendar and contacts. Yes Yes Yes
Mailpile No No No Yes No Limited Yes Yes
meli No Yes No No No Limited Yes Yes
Mew No Yes Emacs. No No No Yes Emacs packages. Yes Yes
nmh No Yes CLI. No No No No Yes Yes
Roundcube No No No Yes Plugin Calendar and address book plugins. Yes Yes No
SnappyMail No No No Yes Limited Kolab support. Yes Yes No
SOGo No No No Yes Yes Calendar, contacts, tasks, and ActiveSync. Limited Yes No
SquirrelMail No No No Yes No Yes Yes No
VM (ViewMail) No Yes Emacs. No No No Yes Emacs packages. Yes Yes
Aerion Yes No No No Limited Contacts and an alpha calendar. Yes Yes Yes
Alps No No No Yes Limited CardDAV and CalDAV. Yes Yes No
Matcha No Yes No No No Yes Yes Yes
Zimbra No No No Yes Yes Calendar, contacts, tasks, and files. Limited Limited Open-source components under ZPL and GPL. No A Zimbra account is required.
Velo Yes No No No No No Yes Yes
Mainly No No No Yes No Limited MCP server. Yes No A Mainly login is required.
Sup No Yes No No No No Yes Yes
Flectar Mail Yes No Yes No Yes Calendar, contacts, and files. No Yes Yes
Jobbox Yes No No No Limited Job-search board. No Yes Yes
DispatchMail No No No Yes No No Yes Yes
Clova No No Limited Yes No No No No
Talanoa No No Limited Yes No No No No
Tallyman Yes No No No No No No No
Omnia Yes No No No No No No Yes
Stillmail No No Yes No No No No No
GotEmail Yes No No No No No No Yes
Busymail Yes No No No No No No Yes
Mocca Yes No No No No No No Yes
Hadavar Yes No No No No No No Yes
WMail No No Yes No No No No Yes
MailDeskt Yes No No No No No No No
Clutterstrike Yes No No No No No No No
Cwmail No Yes No No No No No Yes
Faraday No No No Yes No No No No
Airmail Yes No Yes No No Yes No No
Edison Mail Limited No Yes No No No No No
Missive Yes No Yes Yes Yes Shared inboxes and team chat. Yes Integrations. No No
MailMate Yes No No No No Yes Bundles. No Yes
The Bat! Yes No No No No Limited No Yes
BlueMail Yes No Yes No No No No No
Aqua Mail No No Yes No No No No Yes
Newton Yes No Yes No No No No No
Polymail Yes No Yes Yes No No No No
Nylas Mail Yes No No No No Yes Yes Yes

A value records what each client's own documentation establishes. No can mean a deliberate boundary rather than a missing feature. The comparison page links every client profile and states where Pagkugi is not the right choice.