4xx errors

MSMTP treats 4xx errors as permanent errors. As an example:

msmtp: envelope from address no-reply <at> meetyourmessenger.com not accepted by the server
msmtp: server message: 451 4.7.1 Service unavailable - try again later
msmtp: could not send mail

Exit status: 65 = EX_DATAERR.

What I would expect when getting a 4xx is something like exit status 75 = EX_TEMPFAIL, which would allow me to
use the exit status to tell the difference between an unsendable e-mail (e.g. an invalid receipient
address), and a mailserver that doesn't want to talk right now (e.g. disk full). At the moment the both give EX_DATAERR.

Other temporary errors, like connection refused, already give different exit codes, and I use that to see
which mails should stay in my queue directory for another try, and which to move to a different directory.
But for 4xx errors, as they give EX_DATAERR, I currently use grep on the log files for the rejected mails, to
see which are 4xx errors, and move them back to the queue directory.

Would it be a big change to get 4xx errors as something lige EX_TEMPFAIL?

/Kent

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