Connector Emailer - Error Sending Email - 501 5.0.0 HELO Requires Domain Address

Document ID : KB000047907
Last Modified Date : 14/02/2018
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  • The following error is received within the connector rallylog.log after configuring the <Emailer> in XML:
    • ?WARN : YetiMailer.initialize - Error sending email - 501 5.0.0 HELO requires domain address


  • What is happening is that the <Emailer> is sending your internal system name for Sendmail. The remote server performs a reverse DNS lookup and rejects your HELO as an invalid domain name.?


  • First check the hostname of the connector system and ensure that it is valid:
    • ?Improper Hostname: example
    • Proper Hostname:
  • The address referenced should be a fully qualified name known in DNS. If such a name is unavailable, a domain literal should be used, again for the sending system.?