How to refuse NDR and also grey list

Discussion in 'HOWTO-Related Questions' started by Happy, Mar 22, 2013.

  1. Happy

    Happy New Member

    I installed The Perfect Server - Ubuntu Lucid Lynx (Ubuntu 10.04) ISPConfig some months ago and it has been running fine up until lately. I am only using the following peices pop3/imap using Maildir format and therefore installed Courier-POP3/Courier-IMAP, Mysql, and Postfix. My mail server has been blacklisted several times lately and I am trying to correct the issues:
    My mail server is not an open relay.

    1. Users are getting a lot of NDR's -Is there a way not to accept kicked back mail on the mail server and just refuse it?
    2. Also is there a way to do grey listing to reduce spam?

    I tried getting spam assasin installed sometime ago with no luck.


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