Mail is rejected with error: 550-5.7.1 is likely unsolicited mail

Created:

2016-11-16 12:51:53 UTC

Modified:

2017-08-16 16:20:28 UTC

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Mail is rejected with error: 550-5.7.1 is likely unsolicited mail

Applicable to:

  • Plesk 12.0 for Linux
  • Plesk 11.5 for Linux
  • Plesk 10.4 for Linux/Unix
  • Plesk 12.0 for Windows
  • Plesk 11.5 for Windows

Symptoms

Mail forwarded to Gmail is rejected:

Our system has detected that this message
    550-5.7.1 is likely unsolicited mail. To reduce the amount of spam sent to
    550-5.7.1 Gmail, this message has been blocked. Please visit 550-5.7.1
    http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for 550
    5.7.1 more information. ho13si622251wib.49 - gsmtp (in reply to end of DATA
    command)

Similar issue may occur with other public mail services, like Hotmail etc.

Cause

SPF record is not set properly.

Resolution

To fix the issue for newly created domains, add a TXT record to DNS template ( Server Management > Tools & Settings > DNS Template ):

v=spf1 +a +mx -all 

or

v=spf1 +a +mx +ip4:<ip.mail> ?all 

For existing domains:

on Windows : add a TXT record to its DNS zones

"%plesk_bin%"\dns --add domain.tld -txt "(v=spf1 +a +mx -all)" 

on Linux : modify DNS template

  1. Add TXT record v=spf1 +a +mx -all

  2. Apply the DNS template changes to propagate them to all domains on the server.
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