My email server is running Postfix with postfixadmin-style virtual users and domains. The LDA is Dovecot.
I wanted to add support for $recipient_delimiter so I can get addresses like
user+service@example.com behave like user@example.com.
Most of the documentation says that you just need to set Postfix's
$recipient_delimiter variable to the (set of) character(s) you want to use
as a delimiter, like recipient_delimiter = +. That's fine if you're just
using local delivery. But when you use Dovecot's LDA (or other LDA), you
should also modify how it's called in master.cf.
In my case the dovecot service configuration ended up like this:
dovecot unix - n n - - pipe
flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -f ${sender} -a ${recipient} -d ${user}@${nexthop}
Restarting postfix service made it works.
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