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Helix ALM SMTP Send Mail Error #503
This article includes solutions for the following send mail error 503 problems:
The SMTP server returns a 5.5.2 'Sender Already Specified' or 'One Mail Per Message' error.
Some SMTP servers allow only sending one email per connection. The SMTP server thinks spam is being sent because Helix ALM can send multiple emails during one SMTP connection.
Configure the Helix ALM Server to only send one message per SMTP connection.
The SMTP server returns a 'Bad Sequence' error.
The mail server expects to receive an extra set of commands before Helix ALM initiates the Send Mail command. The extra command could be username and password authentication.
Enter a return email address that Helix ALM can use when sending email notifications.
If the problem is not resolved, you may need to reconfigure your mail server to allow send mail requests from the Helix ALM Server IP address. This maintains the SMTP authentication while allowing the Helix ALM Server to send email.