New comment by Anachron on mblaze repository https://github.com/leahneukirchen/mblaze/issues/205#issuecomment-820712908 Comment: That's what I use but `msmtp` chooses the wrong account in this case: ``` msmtp: envelope from address example1@mail.domain not accepted by the server msmtp: server message: 550-Requested action not taken: mailbox unavailable msmtp: server message: 550 Sender address is not allowed. msmtp: could not send mail (account default from /home/USER/.msmtprc) ``` How does `msmtp` figure out which account to use for my changed from-address?