Rejecting mail with invalid From: header

AndyB78

• January 24, 2019 06:26

On cPanel servers is it possible to reject all emails with an invalid 'From:' or 'Reply-To' address? Also is this useful and reasonable? Thanks!

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  cPanelLauren

  • January 25, 2019 19:17

  Hi @AndyB78 The options cPanel provides for email configuration are present at WHM>>Service Configuration>>Exim Configuration manager. As far as is this useful and reasonable, I would assume that most mail isn't sent without RFC compliant headers do you find that you're seeing otherwise?

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  AndyB78

  • January 25, 2019 22:25

  Hi, Yes, I received from enduser's end some email samples that show invalid From: headers (like missing the @ along with the domain name). Is there a setting in the exim configuration to block such junk mail? Thanks!

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  cPanelLauren

  • January 28, 2019 14:44

  Hi @AndyB78 Not specifically, the biggest reason you'd get mail without a sender would be for auto responses and NDRs do they match any of these circumstances or would it be possible to share the full headers?

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  rpvw

  • January 28, 2019 14:57

  I regularly receive perfectly genuine emails without a 'from' header that come from both reputable sources that should know better by them having added a comma separated list into the BCC in the naive expectation of not disclosing everyone's email address to everyone else, and from end users who have added an email address into the wrong field in their email client. Unless your server only runs one organisational account, and only expects to receive email from infallible sources who never, ever, make mistakes, I would strongly advise against any server wide rule to block such mail, and leave it up to the end user to block or filter the mail as they see fit.

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