There is an updated pull request by nmeum against master on the mblaze repository https://github.com/nmeum/mblaze mrep-check-to-and-cc https://github.com/leahneukirchen/mblaze/pull/173 mrep: Set From header according to To/Cc header I use different mail addresses for different purposes. When replying to any email, `mrep(1)` currently uses the mail address configured as `Local-Mailbox` for the From header. While generally desirable, I do not want to reply to mails I received through my work address with my private email address. This commit introduces a change which uses the email address, the email was sent to, (as specified by To/Cc) for the From header, as long as this address was configured as an `Alternate-Mailboxes`. I just quickly hacked this together as a proof of concept without much further considerations. Seems to work though but not sure if it is generally desirable to enable this behaviour by default, let me know what you think. A patch file from https://github.com/leahneukirchen/mblaze/pull/173.patch is attached