There's a closed pull request on the mblaze repository

mcom: allow tilde prefixed path for profile's outbox setting
https://github.com/leahneukirchen/mblaze/pull/187

Description:
I assumed – perhaps incorrectly – that my `outbox` setting could be `~/Mail/Sent`.  However, doing so fails because the tilde isn’t expanded.  This trivial change fixes that.

Thanks,

James