On Thu, Jun 23, 2011 at 11:56:22AM +0300, Nikolaos Milas wrote: > dovecot unix - n n - - pipe > flags=DRhu user=vmail:vmail argv=/usr/libexec/dovecot/dovecot-lda -f > ${sender} -d ${user} > > Obviously this happens because in this case there is no ${user} data.
It is not clear how the message entered your queue, recipient validation in the SMTP server should be able to reject such mail. The transport mapping to "dovecot" could also be per-user or implemented for a "synthetic" domain to which valid user addresses are rewritten. However, if none of the above is useful, you can I believe use: -d ${user:no-such-user} this may not be documented in the pipe(8) manual page, if sothink this is a rare documentation oversight. Almost universally, undocumented Postfix behaviour is not a "hidden" feature, but rather an implementation artifact, that is subject to change. -- Viktor.