Blacklist outgouing mail
 

Hi,

A major Slovenian free e-mail provider has recently gone bust. As a result, thousands of outgoing e-mails are being deferred in our server's mail logs, as some of the hosted sites still try to send e-mail to these addresses.

Is there a way to tell postfix (through ISPConfig if possible) to completely ignore any e-mail being sent out, whose recipient belongs to a certain domain? Postfix should not try to send such messages and if possible, not even log the attempt.

I tried adding a record to "Email > Global Filters > Postfix Blacklist" with "@offending-domain.tld" as Blacklist Address and Recipient as Type. This doesn't seem to have the desired effect though.

Try this:

add a email route / (transport) in ispconfig with:

domain: offending-domain.tld
type: error
destination: This email address does not exist anymore.

Thanks, till. It worked. The messages no longer go to the queue. However, quite a lot of entries are still added to the logs for a single message:
It looks like the message gets bounced now. Is it possible to send it to /dev/null instead? It's not a big problem if this is not possible. Getting all those messages out of the queue was my first priority. Completely ignoring them would be a better option, but as I said, not strictly necessary.

Take a look at postfix restrictions parameters .. expecially at "reject_unknown_recipient_domain"

Requirements: the dns (mx or a) records of that provider domain must no longer exist.

If it suits your needs you will able ( modding your /etc/postfix/main.cf ) to do the trick in a better way ..you can avoid to receive the entire messages before dropping them (blocking them at smtp first dialog level) .. saving bandwith :-)

Bye..

bajodel.

In this case, the MX record still exists, but the SMTP server is no longer responding, so I guess this option will not help.

The provider in question is actually email.si:
Heh, bandwidth actually isn't a problem in this case, since the postfix server is only being used by the websites running on the same server. I was only hoping to get rid of the log entries and bounced messages, but as I said before, it's just a minor annoyance, not a serious issue. The bulk of the problem has already been solved with till's suggestion.

Ok.. it's not so clean ..but you can 'cook' fake ones :-) configuring that domain in your dns with a TEXT record only.
Postfix will look at MX and A records -> not present -> reject

Ok.. maybe it is not a problem for you, but it could be usefull for others..

Bye..

bajodel.

I'll do that. Thanks for the idea. ;)


You're right. Sorry if I sounded ungrateful.

Thanks, till and bajodel, for helping out.