Thunderbird for Android / K-9 Mail 13.0

Changed:

Sync logging duration is now limited to 24 hours

Fixed:

Client certificate was not displayed in SMTP settings
Outlook headers included unnecessary newlines when replying to a message
"Enable debug logging" did not provide verbose logging
Scrolling in a short email could trigger left/right swipe
Landscape scrolling only worked in center of Welcome and New Account screens
On IMAP servers with folder prefixes, some folder operations stopped working
Reverted word-wrapping change that broke HTML and table rendering
Application crashed when opening placeholder folder