> After I ran this (in fact I was too slow ;-) ), I sent a mail from
> external MTA mail.sys4.de and this mail did not run through any
> of the milters. It is much more worse than I thought, because each
> mail after that "mail loop" above was not scanned by any milters
> anymore! I also stopped postfix and started it again and still no
> milters got connected when sending test mails from external MTA.
If this problem persists after stopping and starting Postfix, then
you have proved that either it is not a Postfix problem or that your
measurement procedure is in error.
There is no POSTFIX Milter-related state that persists across
restarts, but there may be such state elsewhere: rate-limiting
policy servers, state in the kernel's networking stack, clients
deciding to deliver mail elsewhere, ...
Wietse
