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? Thanks, Ruliezz
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. Code: 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: https://www.howtoforge.com/hardening-postfix-for-ispconfig-3 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.
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:
