Pagkugi

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K-9 Mail and Pagkugi

Open-source Android mail client focused on large volumes of mail.

At a glance

IMAP push, unified inbox, multiple identities, PGP/MIME, per-account notifications, and a long Android history.

Where Pagkugi differs. A mobile client with its own cache, where Pagkugi is a desktop Maildir client.

Status
Active; the basis of Thunderbird for Android
License
Apache-2.0
Platforms
Android
Storage
A local Android database and cache; the provider remains the source of truth.
Website
https://k9mail.app/
Source
https://github.com/thunderbird/thunderbird-android

Where K-9 Mail is better

  • IMAP push and background notifications on Android.
  • OpenPGP and PGP/MIME through OpenKeychain.
  • Multiple identities, a unified inbox, and per-account notifications.

Storage and ownership

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

Feature Pagkugi K-9 Mail
Open local storage Yes No
Maildir as the live store Yes No
Works offline Yes Yes

Accounts and protocols

The servers and providers the client can talk to.

Feature Pagkugi K-9 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. Limited Generic IMAP with OAuth where the provider allows it.
JMAP No No

Reading

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

Feature Pagkugi K-9 Mail
In-app HTML rendering No Mail is converted to text instead. Yes Basic HTML view.
HTML converted to text Yes Yes
Conversation threading Yes Yes
Calendar invitations Limited A focused read-only viewer, not a calendar application. Limited Opens .ics attachments; no built-in calendar.

Writing and organizing

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

Feature Pagkugi K-9 Mail
Rich or HTML composition No Composes text/plain; Markdown composition is not released. Limited Basic rich text; plain text is the default.
Snooze or send later No No
Full-text search Yes Yes
Custom incoming filters No The local filter engine is implemented but switched off. No
Tags or labels No Read state only; no general labels or tags. Limited Stars and flags.
Mailing-list actions Yes No
Command palette or keyboard-first No Actions live in explicit context menus. Limited Keyboard shortcuts.
Open-thread work view Yes No

Security and privacy

Encryption, sender checks, and what leaves the machine.

Feature Pagkugi K-9 Mail
PGP / S/MIME No Not built in. Yes OpenPGP through OpenKeychain.
Phishing or sender checks Yes Limited
Remote content blocked Yes Yes
Built-in AI features No No assistant, by design. No

Platform and business

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

Feature Pagkugi K-9 Mail
Graphical desktop app Yes No
Terminal interface No No
Mobile app No Yes
Web or self-hosted No No
Calendar, contacts, or groupware No No
Plugin or extension system No Limited OpenKeychain integration, not a general plugin system.
Open source No Proprietary commercial software. Yes
No account with its maker Yes Yes

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