550 Please turn on SMTP Authentication

Glen M.

• January 17, 2019 13:22

Yesterday, out of the blue, messages to our domain began bouncing back to senders with the message 550 Please turn on SMTP Authentication in your mail client. [removed] is not permitted to relay through this server without authentication. This was only affecting senders that use G-mail so I added an etry to the SPF record - but no luck: +include:_spf.google.com Suggestions?

• 

  LoadFactor

  • January 18, 2019 14:30

  Yesterday, out of the blue, messages to our domain began bouncing back to senders with the message 550 Please turn on SMTP Authentication in your mail client. [removed] is not permitted to relay through this server without authentication. This was only affecting senders that use G-mail so I added an etry to the SPF record - but no luck: +include:_spf.google.com Suggestions?

  
  Same here. This fixed the issue: Next: figure out what the heck went wrong.

  0
• 

  KrisG

  • January 18, 2019 14:38

  I would strongly suggest leaving SMTP authentication on even after you figure out what went "wrong", IMHO.

  0
• 

  cPanelLauren

  • January 18, 2019 19:43

  Yesterday, out of the blue, messages to our domain began bouncing back to senders with the message 550 Please turn on SMTP Authentication in your mail client. [removed] is not permitted to relay through this server without authentication. This was only affecting senders that use G-mail so I added an etry to the SPF record - but no luck: +include:_spf.google.com Suggestions?

  
  To clarify this is only senders that are sending your domain mail from gmail? Do you mean senders who use gmail to send/receive their messages?

  0

Please sign in to leave a comment.