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501 HELO requires valid address
Problem reported by Doug Haverdink - October 29, 2015 at 5:44 PM
Submitted
Facts:
 
  • Version 14.2
  • Running okay years short of lots of spam issues
  • Fairly robust changes to spam filter made
  • Most mail is delivered however getting failures with error messages such as:
    • 501 HELO requires valid address
      ‚Äč
    • 501 Invalid host name mail.xxxxxxx.com/.
    • 501 5.0.0 Invalid domain name
    • 501 5.5.4 Invalid domain name

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