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]> 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]] *On Behalf Of *Richard Stovall > *Sent:* Wednesday, February 11, 2015 9:31 AM > *To:* [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]> > 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 > > > >
