Postfix / Archive Mail duplicates

[Michael Pacey]

I have noticed that if my Archive Mail account is a remote account (an
SMTP hop away) then the correct number of mails (1) is delivered to that
account, not the incorrect number (2).

Where is the Archive Mail function handled in MailScanner? I've trawled
through the MailScanner code and I can't find it (at least, I can't find
any code which looks like it reads this config option, using grep).

I'm pulling my hair out!

Cheers!
--
Michael Pacey <michael at wd21.co.uk>