I have been using the http://www.libsrs2.org/srs/Mail-SRS-0.31.tar.gz
for the last seven years. Unfortunately, I have been using it with
sendmail, so I cannot give you specific details about implementation
with postfix. Generally, I keep a file of domain names that are
the virtual aliases. That list is checked by SRS for alias/unalias
work before normal processing happens. I just have to automatically
rebuild the file if there is a change in the virtualization data files.
Should SRS not be handled at the actual point of forwarding.
We use postfix + cyrus and forwarding is done by sieve.
IMHO sieve should have a plugin to do SRS. This is not the work of postfix.
Thanks
Ram
PS:
Anyway Wietse is not very appreciative of SPF or SRS
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