[Dovecot] PATCH: Deliver looses mail and DSN if Return-Path is missing

[Matthias Andree]

Steffen Kaiser schrieb:

> BTW: Would it be possible to return the errno of the failed system call
> to the MTA via the main() return value? I believe that any MTA will act
> upon these codes and the postmaster can setup the preferred way handling
> bounces.

No, the "any" MTA - excluding qmail and other incompatible stuff(*) -
will act upon sysexits.h values, not errno values (which are often
outside the range for exit codes anyway).

(*) at least it treats EX_TEMPFAIL (75) as temporary failure.