K-9 Mail v5.003 (stable)

• Fixed crash when selecting multiple messages on Android 5.1

K-9 Mail v5.002 (stable)

• Fixed a bug where a certificate error was wrongly reported

K-9 Mail v5.103 (alpha)

• Added ability to customize lock screen notifications (Android 5.0+ only)
• Fixed a bug where a certificate error was wrongly reported
• Updated translations

K-9 Mail v5.102 (alpha)

• Improved 'open' functionality for attachments
• Removed APG legacy interface
• Fixed bug in Russian translation

K-9 Mail v5.101 (alpha)

Changes in v5.101:

• Fixed build problems that caused v5.100 to request the permissions READ_CALL_LOG and WRITE_CALL_LOG

K-9 Mail v5.001 (stable)

Changes in v5.001:

• Removed SSL/TLS session caching because it was causing problems

K-9 Mail v5.100 (alpha)

Changes in v5.100:

• Removed SSL/TLS session caching because it was causing problems

K-9 Mail v5.000 (stable)

Changes in v5.000:

• Updated version number to 5.000

K-9 Mail v5.000 RC1 (almost stable)

Changes in v5.000 RC1:

• K-9 Mail now requires at least Android 4.0.3
• Added support for OpenPGP API v3 (get OpenKeychain)
• Added ability to use client certificates for authentication
• Enabled support for TLSv1.1 and TLSv1.2
• Added SSL/TLS session caching
• Offer encrypted connection by default when manually setting up an account
• Simplified options for authentication and security
• Removed auto-configuration settings for all providers that didn't support encrypted connections
• Added privacy setting to omit the User-Agent header
• Added privacy setting to use UTC as timezone in mail headers
• Finer grained control for notifications
• Added support for delete confirmations in the message list
• Added the option to show the password when setting up new accounts
• Added a slider to allow picking a font size for the message body (40% to 250%) in settings
• Added support for KitKat's Storage Access Framework that allows you to attach multiple files at once
• Multiple bug fixes
• Updated translations

K-9 Mail v4.905 (alpha)

Changes in v4.905:

• Dropped support for Android versions older than 4.0.3
• Added ability to use client certificates for authentication
• Enabled support for TLSv1.1 and TLSv1.2
• Added SSL/TLS session caching
• Finer grained control for notifications
• Added support for delete confirmations in the message list
• Added the option to show the password when setting up new accounts
• Added privacy setting to omit the User-Agent header
• Added privacy setting to use UTC as timezone in mail headers
• Added auto configuration settings for various providers
• Fixed HELO/EHLO with IPv6 address literals
• Various bug fixes
• Added translations: Latvian, Estonian, Norwegian Bokmål, Galician (Spain)