What's new in this version:

• Add a Correspondents column combining Sender and Recipient
• Much better support for XMPP chatrooms and commands.
• Remote content exceptions: Improved options to add exceptions.
• Implement option to always use HTML formatting to prevent unexpected format loss when converting messages to plain text.
• Use OpenStreetmap for maps (even allow the user to choose from list of map services)
• Allow spell checking and dictionary selection in the subject line
• Allow editing of From when composing a message.
• Add dropdown in compose to allow specific setting of font size.
• Return/Enter in composer will now insert a new paragraph by default (shift-Enter will insert a line break)
• Allow copying of name and email address from the message header of an email
• Mail.ru supports OAuth authentication.

What's fixed in v45.0:

• When sending e-mail which was composed using Chinese, Japanese or Korean characters, unwanted extra spaces were inserted within the text.
• Spell checker checked spelling in invisible HTML parts of the message.
• When saving a draft that is edited as new message, original draft was overwritten.
• External images not displayed in reply/forward
• Crashed in some cases while parsing IMAP messages.
• Properly preserve pre-formatted blocks in message replies.
• Copy/paste from a plain text editor lost white-space (multiple spaces/blanks, tabs, newlines)
• "Open Draft"/"Forward"/"Edit As New"/"Reply" created message composition with incorrect character encoding.
• Grouped By view sort direction change was broken, plus enabled custom column grouping.
• New emails into a mailbox did not adhere to sort order by received.
• Box.com attachments failed to upload.
• Drag and drop of multiple attachments failed to OS file folder.
• XMPP had connection problems for users with large rosters