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TestTrack SMTP Send Mail Error #503

Article ID: 341  |  Last updated: 31 Dec, 2014

Note: The following information only applies to TestTrack 2013.0.2 and earlier.

This article includes solutions for the following send mail error 503 problems:

  • Sender already specified
  • One mail per message
  • Bad sequence


The SMTP server returns a 5.5.2 Sender Already Specified or One Mail Per Message error.


Some SMTP servers allow only a single email to be sent per connection. The SMTP server thinks spam is being sent because TestTrack can send multiple emails during one SMTP connection.


Configure the TestTrack Server to only send one message per SMTP connection.

  1. Start the TestTrack Server Admin Utility.
  2. Click Server Options then click Sending from the Email category.
  3. Make sure Enable sending mail via Simple Message Transport Protocol (SMTP) is selected.
  4. Select 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 TestTrack initiates its Send Mail command. The extra command could be Username and Password authentication.


Enter a return email address that TestTrack can use when sending email notifications.

  1. Start TestTrack.
  2. Log in to the project that you want to configure.
  3. If you are using the TestTrack Client, choose Tools > Administration > Project Options.
    If you are using TestTrack Pro Web, click the Configure tab then click the Project Options.
  4. Click the Email tab.
  5. Enter a return email address for TestTrack to 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 TestTrack Server IP address. This maintains the SMTP authentication while allowing the TestTrack Server to send mail.

Article ID: 341  |   Last updated: 31 Dec, 2014
SMTP 503 sender already specified one mail per message bad sequence

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