To uninstall balsa just follow these instructions.
sudo apt-get remove balsa
This will remove just the balsa package itself.
sudo apt-get remove --auto-remove balsa
This will remove the balsa package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for balsa then this will work.
sudo apt-get purge balsa
Or similarly, like this balsa
sudo apt-get purge --auto-remove balsa
|Maintainer||Debian GNOME Maintainers <email@example.com>|
|Description||e-mail client for GNOME It supports both POP3 and IMAP servers as well as the mbox, maildir and mh local mailbox formats. Balsa also supports SMTP and/or the use of a local MTA such as Sendmail.|