Joe Postfix:
> Does anyone know if postfix supports a feature equivalent to
> relay_based_on_MX in sendmail?
Wietse:
> Yes.
>
> However such features must not be used because they accept mail
> for non-existent recipients, and therefore 1) they fill the Postfix
> queue with non-deliverable MAILER-DAEMON messages, and 2) the
> MAILER-DAEMON messages that can be delivered will bother innocent
> people about mail that they did not send.
Joe Postfix:
> Can you explain how this feature could be enabled?
>
> One of our the services we offer our customers allows them to create as many
> domains as they like (on various DNS's), and we have a catchall mailbox that
> grabs any emails sent to those domains.
What happens when a spammer points an MX record at your server?
Wietse
> Of course you are correct most of the content on there is spam (at times,
> over %90), but certain campaigns will have our customers sifting through
> those mountains of spam for accountability purposes, etc.
>
