AnsweredAssumed Answered

Email auto reply Issue

Question asked by f3aeb9e180314250bffd21750301351e7010be29 on Apr 12, 2018
Latest reply on Apr 12, 2018 by Sanford Whiteman


Yesterday we launched an email around 2 pm PST to a very small segment of lead DB.

Around 8:00 pm PST we received around 200 auto-replies in outlook inbox. I tried to search for the domain or email in my DB but I could not find anything related to the email below in my DB. All the auto-replies has the same domain- "'.


Below are the details of errors-

Original Message Details

Created Date:

4/12/2018 3:01:29 AM

Sender Address:

Recipient Address:


  1. ITSCOM.NET: Email Confirmation

Error Details

Reported error:

550 5.0.350 Remote server returned an error -> 550 #5.1.0 Address rejected.

DSN generated by:

Remote server:


Is this Marketo delivery issue or some Microsoft outlook issue. I searched the web but could not find any resolution to that. I am not a domain or email deliverability expert so looking for suggestions to resolve the issue.