Noel Jones:
> Also sounds as if you don't have a valid recipient list for
> these customers. Not OK. Your queue is likely filled with
> lots of undeliverable mail to unknown recipients, and
> undeliverable bounces to bogus senders, plus you're sending
> out backscatter to innocent parties. This will get you
> blacklisted.
>
> The solution is two steps.
>
> First, if you can't get a valid recipient list you can use
> address verification so that you don't accept mail to bogus
> users in the first place. This is really important.
> http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient
I agree with this. The problem is that your machine is accepting the mail.
> The second step isn't required, but will reduce load on your
> system. Convince them (use a creative explanation about
> system security) to log in as root and run this one-line patch
> to their system:
> postconf -e unknown_local_recipient_reject_code=550
Maybe they can be convinced that this presents no loss of mail.
Postfix 2.4 and later no longer reply with 450 for non-existent
local recipients.
Wietse
