Doh! Your timing is impeccable. Our network admin just found where he had blocked a range of >suspicious< IPs from overseas. Apparently our vendor in the US passes their email off to servers in Germany. Mail is flowing now. Thanks everybody!
From: [email protected] [mailto:[email protected]] On Behalf Of Richard Stovall Sent: Wednesday, February 11, 2015 9:51 AM To: [email protected] Subject: Re: [Exchange] Incoming email from single company being rejected with 4.4.7 Are you by chance blocking them at your firewall? Maybe ask your fw admin to check the ruleset for any recent change that may be causing the problem? (Certainly I have never inadvertently caused such a problem by instituting an overly aggressive rule. But I have a friend that has.) On Wed, Feb 11, 2015 at 10:41 AM, Maglinger, Paul <[email protected]<mailto:[email protected]>> wrote: I’m not seeing anything incoming in the SMTP logs at all. I see our outgoing just fine. From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Richard Stovall Sent: Wednesday, February 11, 2015 9:31 AM To: [email protected]<mailto:[email protected]> Subject: Re: [Exchange] Incoming email from single company being rejected with 4.4.7 Do you show any corresponding SMTP connections at all on your edge equipment, or is it a pure timeout on their side? On Wed, Feb 11, 2015 at 10:18 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
