New comment by nmeum on mblaze repository https://github.com/leahneukirchen/mblaze/pull/173#issuecomment-616580590 Comment: > We could default to `Alternative-Mailboxes` when `Reply-From` is unset. Sure but imho that would complicate the code a bit (more case distinctions) as the fallback is needed both here: https://github.com/leahneukirchen/mblaze/blob/4e4dcdf1cab41e975139bf62d666ed16594507df/mcom#L19-L20 and here: https://github.com/leahneukirchen/mblaze/blob/4e4dcdf1cab41e975139bf62d666ed16594507df/mcom#L367 > Sorry, I lost track of this PR in my todo list. So did I.