Could you talk them into doing a manual telnet to you and see if it gives any extra info?
From: [email protected] [mailto:[email protected]] On Behalf Of Steve Ens Sent: Wednesday, February 11, 2015 10:34 AM To: Micheal Espinola Jr Subject: Re: [Exchange] Incoming email from single company being rejected with 4.4.7 Hi Paul What kind of antispam filtering software are you using? Check out the blacklists? Steve On Wed, Feb 11, 2015 at 9:18 AM, Maglinger, Paul <[email protected]<mailto:[email protected]>> wrote: 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
