Email Forward Abuse

Discussion in 'Server Operation' started by ruliezz, Jul 13, 2020.

  1. ruliezz

    ruliezz Member

    Hi all,

    Some of my email users have configured a mail forward from there mail domain to for instance Gmail.
    When they receive spam on their email address it has also been forward to Gmail what results in a blocked IP.

    Is it possible to configure SPAM filtering on outgoing forward emails in ISPConfig?
    Or how do you solve this kind of problem?

  2. Taleman

    Taleman Well-Known Member HowtoForge Supporter

    My users also forward e-mails to GMail, but e-mail server does not end up in blacklist. Instead GMail delays mails due to large number of spammy messages arriving from my e-mail servers.
    Our system has detected an unusual rate of 421-4.7.28 unsolicited mail originating from your IP address. To protect our 421-4.7.28 users from spam, mail sent from your IP address has been temporarily 421-4.7.28 rate limited.
    I have not found a way to completely prevent this.
    What does help, is to filter incoming e-mails so less spam gets in and thus less spam is forwarded to GMail. Not accepting e-mails from bad senders works wonders.
    You seem to ask about ISPConfig despite posting on LInux forum. Then this Tutorial may be useful:
    It is possible, but not much help in your case. If the filter did not catch the e-mail when it was coming in, it is not likely to catch it when forwarded either.
    I changed my ISPConfig e-mail servers to use RSpamd, that filters also outgoing e-mails without extra configuration.
  3. ruliezz

    ruliezz Member

    Oh yes, that was the message I got indeed. It's been a while ago because I currently use a third party to scan my emails before they go out as you do with RSpamd.

    Yes, this should be more a question for ISPConfig section. Would you be enable to migrate my topic to that section?

    So back to ISPConfig, It would be nice if ISPConfig has a spam filter option on their forwarders like they do with the graylist. See screenshot:
    Screenshot from 2020-07-13 12-01-53.png

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