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)

K-9 Mail v4.804 (stable)

Changes in v4.804:

• Fixed a bug with IMAP Push that could cause excessive battery drain
• Exclude error folder from unread/starred count
• Avoid adding the same recipient twice when using "reply to all"
• Improved compatibility with IMAP (proxy) servers
• Improved support for non-standard conform "share" functionality used by some apps
• Another attempt at working around the display bug on Asus Transformer devices
• Added mailbox.org to the list of providers
• More bug fixes

K-9 Mail v4.904 (alpha)

Changes in v4.904:

• Added support for OpenPGP API v3
• Fixed problems with IMAP login
• Updated translations
• Fixed multiple bugs

K-9 Mail v4.903 (alpha)

Changes in v4.903:

• 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
• Improved compatibility with IMAP (proxy) servers
• More small fixes and improvements

K-9 Mail v4.902 (alpha)

Changes in v4.902:

• Avoid adding the same recipient twice when using "reply to all"
• Fixed a bug with bitcoin URIs
• Added mailbox.org to the list of providers

K-9 Mail v4.901 (alpha)

Changes in v4.901:

• 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
• Added support for apps that don't know how to properly use Android's 'share' functionality
• Fixed a bug with IMAP Push that could cause excessive battery drain
• Another attempt at working around the display bug on Asus Transformer devices
• Don't lose formatting of the quoted message when changing orientation while replying
• Disabled pull-to-refresh in search views where remote search isn't allowed
• More bug fixes
• Updated Japanese translation

K-9 Mail v4.803 (stable)

Changes in v4.803

• Removed the work-around for the display bug on Asus Transformer devices introduced in v4.802 because it was causing problems
• K-9 Mail now uses a locale-specific date in the header of a quoted message
• Fixed bug where inline images where not showing in KitKat
• Fixed POP3 STLS command
• Added auto-configuration settings for some providers
• Updated Dutch, Spanish, Danish, Slovak, Russian translation
• More bug fixes

K-9 Mail v4.900 (alpha)

Changes in v4.900:

• K-9 Mail now uses a locale-specific date in the header of a quoted message
• Added support for bitcoin URIs
• Changed the way we harden SSL/TLS sockets; Blacklist a couple of weak ciphers, bring known ones in a defined order and sort unknown ciphers at the end. Also re-enable SSLv3 because it's still used a lot.
• Display proper error message when certificate couldn't be verified against global key store
• Fixed inadequate certificate validation. Proper host name validation was not being performed for certificates kept in the local keystore. If an attacker could convince a user to accept and store an attacker's certificate, then that certificate could be used for MITM attacks, giving the attacker access to all connections to all servers in all accounts in K-9.
• Make sure to return different colors for senders with different name, but the same mail address (e.g. mails sent by certain issue tracking systems).
• Fixed bug where inline images weren't displayed on KitKat
• Fixed file selection for import on KitKat
• Fixed a bug with POP3 STLS command
• Added/updated auto-configuration settings for some providers
• Updated Brazilian Portuguese, Czech, Danish, Dutch, French, Greek, Hungarian, Polish, Russian, Slovak, Spanish, and Ukrainian translations