So I'm inclined to speculate that the alias in question is via a
(recipient?) canonical mapping, rather than virtual(5) aliasing?
Or, perhaps more likely, that alternatively, the message is processed by
local(8), with local(8) aliases(5) doing the rewrite, and then again
goes through a milter because the target of the alias is not a local
recipient (domain is not in $mydestination) and the message is delivered
indirectly by creating a new queue file to handle the resulting
recipipient.
So the message goes through two milters, incoming (pre-queue) via
smtpd(8), and again outgoing (post-queue) when forwarded by local(8).
Logging coming from the milter shows that it only runs once (but called twice, RCPT
& DATA) for mail received over 25 from the world and handed off to dovecot lmtp
for placement to the inbox.
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql_email_domains
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql_email_addresses
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql_email_aliases
virtual_transport = lmtp:unix:private/dovecot-lmtp
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