+ - RFC 2046: Send mixed messages with multipart/alternative nested boundaries
+ with correct boundary strings.
+ - EXPERIMENTAL: Mailbox listing converted to templated layout. Added
+ template support functions and classes. Rewrote some page header and
+ mailbox listing functions. Disabled 'show_recipient_instead' option.
+ Added more columns to mailbox listing and index order options.
+ - Removed sort by internal date option. Now you can use the Received column
+ in the index order option page for that.
+ - WARNING: if same user data storage location is used to store SquirrelMail
+ 1.4.x and 1.5.1+ user settings, SquirrelMail 1.5.1+ will reset mailbox
+ display order (Options->Index Options) in stable. Backup your data before
+ testing 1.5.1+ or use different storage location.
+ - Added experimental iframe sandbox for display of html formated emails.
+ - Disabled LOGINDISABLED check in src/login.php when IMAP server mapping is
+ used.
+ - Check destination folder in mail_fetch plugin before storing messages
+ in it. Modify destination folder, if it is renamed or deleted within
+ SquirrelMail (#584658).
+ - Made the Flags column a required column in the index order options page to
+ prohibit missing seen/unseen info in the messages list.
+ - Fixed disabled prev/next links in the message display when you reach the
+ end of the page (message set).
+ - Moved delete button to the right in the message list.
+ - Fixed imap capability detection in bug_report plugin. It was broken
+ when IMAP TLS was enabled or imap server mapping was used.
+ - Added mail_fetch plugin configuration file and moved plugin functions
+ from setup.php to functions.php file.
+