Thank you for the nice Thunderbird,
and I have some suggest or issues
1. Design UI and icons, the current UI and icons are ugly.
2. When pasting an Excel table, there is no grid line after sending the email.
3. The signature supports classification, writing emails, replying to emails, and forwarding emails can use different signatures.
4. Support font size selection, such as 6, 8, 9, 10, 11, 12, 14.....
5. Support AutoArchive.
6. Support batch import and export of emails with .eml format and .PST format
7. Support large-capacity inbox, such as more than 60GB.