Sudden "Please turn on SMTP Authentication in your mail client"

danitheman

• November 09, 2023 06:31

Emails sent through my server, including a mailman list, all started bouncing with the message listed at the end. No recent configuration change to the server other than updating to cPanel 116.0.3. Mail exchangers are set to local. I googled and tried disabling the FKA SMTP Tweak. For now emails seem to get delivered but for the last few months this setting was enabled and I had no issues. Any ideas? I worry this might happen ahain. Diagnostic-Code: smtp; 550-Please turn on SMTP Authentication in your mail client. XXX.MYSERVER.COM 550-[XXX.XXX.XXX.XXX]:57333 is not permitted to relay through this server 550 without authentication.

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  cPRex Jurassic Moderator

  • November 09, 2023 20:36

  Hey there! Since you're using version 116, I'm guessing this is at least a somewhat recent system. Is it possible that you have also installed or made adjustments to CSF?

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  danitheman

  • November 10, 2023 06:23

  I do have CSF but its SMTP_BLOCK is set to off. Now I am stuck with SMTP restrictions to off, and I do get my security advisor complaining about it.

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  cPRex Jurassic Moderator

  • November 10, 2023 12:41

  Could you please submit a ticket to our team so we can look into this? You shouldn't have to turn that option off to prevent that error message from happening.

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