Pagkugi

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Penguin Mail and Pagkugi

Full GTK desktop client with mail and calendar.

At a glance

Gmail, Microsoft Graph, IMAP, POP3, JMAP, calendar, contacts, PGP/S/MIME, Gmail-native labels and filters, and an optional assistant.

Where Pagkugi differs. A broader application than Pagkugi: it renders HTML, owns calendar and contacts, and supports provider-specific accounts.

Status
Active
License
GPL-3.0-or-later
Platforms
Linux, macOS
Storage
A local SQLite cache holding recent mail; the provider remains the source of truth.
Website
https://penguin-mail.com/
Source
https://github.com/c9dev/penguin-mail

Where Penguin Mail is better

  • Gmail, Microsoft Graph, IMAP, POP3, and JMAP accounts in one client.
  • HTML reading, calendar, contacts, PGP/S/MIME, and Gmail-native filters.
  • Send later, Remind Me, VIPs, Smart Mailboxes, and nineteen languages.
  • Distribution across Debian, RPM, Arch, Flatpak, Snap, and macOS.

Storage and ownership

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

Feature Pagkugi Penguin Mail
Open local storage Yes No
Maildir as the live store Yes No
Works offline Yes Limited Recent mail and the inbox are cached; older mail is fetched on demand.

Accounts and protocols

The servers and providers the client can talk to.

Feature Pagkugi Penguin Mail
IMAP and SMTP Yes Yes
POP3 No Not in the first release. Yes
Gmail account No Provider-specific account model is not supported. Yes
Microsoft / Exchange No Exchange-specific account model is not supported. Yes
JMAP No Yes

Reading

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

Feature Pagkugi Penguin Mail
In-app HTML rendering No Mail is converted to text instead. Yes Sandboxed, scripts off, remote images blocked.
HTML converted to text Yes Yes
Conversation threading Yes Yes
Calendar invitations Limited A focused read-only viewer, not a calendar application. Yes

Writing and organizing

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

Feature Pagkugi Penguin Mail
Rich or HTML composition No Composes text/plain; Markdown composition is not released. Yes
Snooze or send later No Yes Remind Me and Send Later.
Full-text search Yes Yes
Custom incoming filters No The local filter engine is implemented but switched off. Yes Gmail filters, Microsoft rules, and Sieve.
Tags or labels No Read state only; no general labels or tags. Yes Labels.
Mailing-list actions Yes No
Command palette or keyboard-first No Actions live in explicit context menus. Limited Keyboard shortcuts, not a command palette.
Open-thread work view Yes No

Security and privacy

Encryption, sender checks, and what leaves the machine.

Feature Pagkugi Penguin Mail
PGP / S/MIME No Not built in. Yes
Phishing or sender checks Yes Limited
Remote content blocked Yes Yes
Built-in AI features No No assistant, by design. Yes Optional assistant.

Platform and business

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

Feature Pagkugi Penguin Mail
Graphical desktop app Yes Yes
Terminal interface No No
Mobile app No No
Web or self-hosted No No
Calendar, contacts, or groupware No Yes Calendar and contacts.
Plugin or extension system No Limited Assistant skills and MCP servers.
Open source No Proprietary commercial software. Yes
No account with its maker Yes Yes

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