K-9 Mail

4.5
AndroidGoogle PlayRuStore

What it actually doesK-9 Mail is a free email client with IMAP/SMTP support, OpenPGP encryption, and multiple account management. It operates stably without ads, but has issues with notification synchronization, attachment import, and adding some email providers.

45%Marketing ≈ reality35%Stability98%Live project

Actually does

  • Email client95% of reviews
  • Multi-account30% of reviews
  • End-to-end encryption10% of reviews
  • Ad-free(bonus)25% of reviews
  • Open source

Claimed, but not confirmed by reviews

  • Sync across devices
  • Local and server-side search
  • No telemetry
  • Push Notifications

Common complaints

  • Push notifications and sync don't work reliably - users report emails arriving only after phone reboot or app restart20% of mentions

    «Push notification for emails only arrives after rebooting the phone and after updating»

  • Requires manual IMAP/POP3 settings even for major providers; many users unable to set up Gmail, Outlook, Yandex accounts15% of mentions

    «Unable to add any account. Neither Gmail, nor Yandex... Just won't authorize»

  • Attachments sent via file manager arrive empty (0 KB) on recipient side despite appearing attached10% of mentions

    «File is attached... but arrives to the recipient empty (0 kb)»

  • Emails visible on desktop/web but not syncing to phone, or only partial sync of messages15% of mentions

    «Not all emails arrive! That is, they're visible on PC, but on the phone they're missing»

  • Mail sync becomes extremely slow or hangs for hours without stopping, requiring force-close10% of mentions

    «It's become very slow to check mail and it doesn't stop... I've been trying to check my email for 3 hours»

What people praise

  • Completely free with no advertising or tracking

    «Free and no ads»

  • One of few email clients with native OpenPGP encryption support via OpenKeychain integration

    «Excellent app, the only one supporting PGP»

  • Simple, no-bloat interface focused on core email functionality; works fast even with large volumes

    «K-9 Mail is a working tool without unnecessary frills. It works fast and doesn't slow down with large volumes»

  • Intuitive gesture controls for quick actions (swipe to delete, etc.)

    «It's so convenient to use gestures, just swipe and delete»

  • Flexible settings for notifications (custom ringtones per account, LED notifications), date/time formatting

    «You can choose a custom ringtone for each mailbox and enable LED notifications»

Where to install