Hi Josef, On 04/18/2013 11:06 AM, Josef Karliak wrote: > Good morning, > our outgoing smtp server gets into a backscatter blacklist. When I > checked my logs, there were only one mailer daemon email to some server > in the time that is mentioned on the backscatter web. > In all servers in the way of the email (incoming MX->antispam server-> > our imap server) has unknown_local_recipient_reject_code = 550. > What else could I do ? There could be one thing - incoming MX accept > all emails for our domain, he doesn't know our aliases. The mail is send > to antispam and when antispam wanna sent the email to imap server and > the target email address doesn't exists, it has 550 error and it is send > away by our antispam server (it is our outgoing server). > So, is this all wrong ? We decided to have more servers because of > loading reasons (we've daily up to 15 000 emails, but there were a 60 > 000 peak)
You can have "reject_unverified_recipient" on the MX to check the IMAP server if the email address exists before accepting it. HTH, Mikael
