Exchange 2010 issuing NDRs to Hotmail/Live & few other domains on receipt of message
- by John Patrick Dandison
I'm working through a beast of an issue at the moment.
Exchange 2010 single server on prem
Hybrid deployment to Office 365
ESMTP filtering turned off on ASA
Certain domains (most consistently, Hotmail/Live) cannot send us mail. At one point, we couldn't send out either, but I created a new Send Connector that forces HELO instead of EHLO.
I…