mail not sending to gmail

Discussion in 'Installation/Configuration' started by Md. Mohib Billah, Dec 29, 2020.

  1. Dear Till,
    How are u? I was setup fresh perfect server and using email feature. When sending email to any gmail address message not sending. Please see this undelivered error message
    host[] said:
    550-5.7.26 This message does not have authentication information or fails
    to 550-5.7.26 pass authentication checks. To best protect our users from
    spam, the 550-5.7.26 message has been blocked. Please visit 550-5.7.26 for more 550
    5.7.26 information. n66si37255584pfd.186 - gsmtp (in reply to end of DATA

    Please help me to solve this issue.
  2. Th0m

    Th0m ISPConfig Developer Staff Member ISPConfig Developer

    There are more people on this forum than just Till ;)
    They refer to this page in the error message:
    On that page, you can read the sender guidelines. You should have a SPF, DKIM, and DMARC record. Your mailserver needs a reverse DNS record for the IP aswell, with the hostname of the mail server.

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