:-)
My postfix configuration is quite complex with a lot of special cases and rules. However I'd like to make an anti-spam configuration as simple and lightweight as possible (KISS).

/etc/postfix/master.cf
------------------------------------------------------------------------
smtp      inet  n       -       n       -       -       smtpd
  -o content_filter=spamassassin

spamassassin unix -     n       n       -       -       pipe
user=nobody argv=/usr/bin/vendor_perl/spamc -e /usr/sbin/sendmail -oi -f ${sender} ${recipient}
------------------------------------------------------------------------

then the simplest sieve rule I can think of:
------------------------------------------------------------------------
require "fileinto";
if header :contains "X-Spam-Flag" "YES" {
  fileinto "Spam";
}
------------------------------------------------------------------------

I'd like to make this rule active for only local deliveries via dovecot LMTP with sieve plugin and setting postfix `mailbox_transport' to dovecot LMTP.

I believe it is so simple it should work (am I wrong?). But...
It would be more convenient to do some tests before applying changes to a production environment config. The problem is: I have no separate testing environment with my strange configuration I'm able to test a spamassassin score for an e-mail manually. How about dovecot LMTP? Can I test local mail delivery by dovecot LMTP manually? I mean: to simulate "I'm the Postfix" and produce for some testing e-mail the same effect as postfix granting it via `local_transport' to dovecot?

Best regards,
Marek

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