write sender as "<>" rather than "<@>" when logging a bounce delivery.
use a much smaller mta_envelope structure within the mta, rather
than the full-blown all-in-one envelope.
allow using backends that declare K_ALIAS when virtual
Merge branch 'master' of ssh://ssh.poolp.org/git/opensmtpd
Merge branch 'mta-envelope'
Merge branch 'master' into portable
add missing #include "includes.h" in imsgproc.c