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how to disable non-delivery reports in Exim

Discussion in 'E-mail Discussion' started by 0884094, Apr 30, 2019.

  1. 0884094

    0884094 Member

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    Hi friends, is there a way to disable non-delivery reports in Exim?

    My server hosts ~400 domains and I allow my users to set up email forwarding only, with catch-all forwarding as the default... so like [all]@example.com => example @ gmail.com. Periodically we'll get swamped with thousands of spam emails to abc123@example.com which are then forwarded to gmail.com, which rejects them -- and counts them against our reputation -- and then they all get backscattered, further hurting our reputation.

    I'm already doing everything I can to validate at SMTP-time and reject any emails possible at that time, so the only remaining problems are the async forwards which have a valid forward rule set up but the remote server ends up rejecting after the fact.

    I'd be happy to just disable NDR entirely... or if I can make them go to a system address that I control instead of the original-from, that'd help.

    Currently I've blocked them (I think) by setting up a custom SPF record for ns1.example.com which doesn't allow sending from any valid IP, so the NDR from Mailer@ns1.example.com is flagged... and then I have set "(*) Scan outgoing messages for spam and reject"... which seems to be blocking NDRs from leaving my server but I think it's messing up other stuff too... if there was a clean Exim config option, I'd use that.

    Thanks!
     
  2. LucasRolff

    LucasRolff Well-Known Member

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    Hi,

    Please do not use catch-all, please do not blindly forward emails to gmail.

    You're asking for trouble, and sure you'll get backscattered - that's the beauty - which in itself is enough reason to not do what you're trying to do.
     
  3. cPanelLauren

    cPanelLauren Forums Analyst II Staff Member

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