We're having an issue with one company trying to send us emails. They get a 4.4.7 whether replying to or sending a new email. They can receive emails from us just fine. They apparently aren't having a problem with any other company. Things I've found keep saying that the problem is on the recipient (our) server, but we're getting email from everyone else just fine. I've run a DNS report for both domains and it looks okay. As they are the only one we're having a problem with - I'm pointing the finger at the DNS on their end but willing to consider something on mine. I'm trying to help them out, but there's only so much I can do from my side. Any thoughts on this to build a case either way?
-Paul
