Reflexion KBA's
503 MAIL FIRST
Posted by Max McElroy on 30 June 2017 11:12 AM

If you are seeing a 503 MAIL FIRST error in a client's outbound queue, this could stem from a number of issues:

1: The MAILFROM field in the message is blank

2: If part of a multiple recipient message, one of the recipients addresses is blacklisted within Reflexion

3: If from a Distribution list, NDR tracking is not enabled.

To solve both 1 and 3, please open up the mail contact/user object properties in AD and confirm that the "Manager" checkbox on the Organization tab is selected, and filled in.

To solve 2, please provide a list of the recipients to Reflexion Support and they will compare against our internal blacklist.

Please note, that causes 1 and 3 are the most likely reasons for this.  Please check these first.

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