I have SBS 2011 setup with Exchange. I am having an issue where certain domains (Comcast.net, gmail, yahoo, Hotmail) will get stuck in our spam filter (reflexion.net) and will give the error below.
"Connected to x.x.x.x but connection died. (#4.4.2) "
Majority of emails have no problem and its not even all gmail, Hotmail, and Comcast emails. Some get through fine where others get stuck in the queue and keep on retrying.
I checked with reflexions and they suggested turning off content filtering.......which was already done anyways.
Anything else anyone has run into? Its resolving the MX records just fine to the spam filter so I don't believe its DNS. Seems like maybe something within exchange?