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550-5.7.1 This message does not have authentication information

Getting a lot of users' contact me with bounce messages. Is this a result of mail sending policy change?

Comments

  • Can you paste a copy of the bounce for me to look at so I can see what the cause of the bounce is?

  • Email is not being sent to certain people with the error message as follows. Please advise. In this case it was an email to a Gmail account, but it has happened to other domains.

    550-5.7.1 This message does not have authentication information or
    fails to pass 550-5.7.1 authentication checks. To best protect our users
    from spam, the 550-5.7.1 message has been blocked. Please visit 550-5.7.1
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.1 information. 
    

    This could be because of DKIM and SPF not being setup I believe?

  • That is exactly the reason why. Google is starting to require it when sending to them. They did this about 5 months ago but really started enforcing this in the past few weeks.

    You can see the guide here for enabling DKIM and SPF.

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