I'd use blat on the Exchange server send a test message, with debug settings to get the full SMTP conversation.
Kurt On Tue, Oct 7, 2014 at 1:02 PM, Steve Ens <[email protected]> wrote: > Yes, already tried that. I can do a MX lookup, but cannot telnet to the > server. Also getting this in the logs Error Code: 10061, Error Message: > No connection could be made because the target machine actively refused it > That seems to point to us being blacklisted, but I come up clean on the > mxtoolbox tests. > > On Tue, Oct 7, 2014 at 2:48 PM, Kennedy, Jim <[email protected]> > wrote: >> >> What are the domains? Could be bad bounces from spam to non-existent >> domains Your server can not contact them, so it tried alternates either in >> dns or per the RFC’s (for example A record of domain.com) and that failed. >> So it is still trying. >> >> >> >> Do an MX lookup from your transport server to verify your DNS is working. >> Then try telnet port 25 from the transport server to that IP to verify >> connectivity. What do you get? >> >> >> >> From: [email protected] >> [mailto:[email protected]] On Behalf Of Steve Ens >> Sent: Tuesday, October 7, 2014 3:42 PM >> To: [email protected] >> Subject: [Exchange] 421 4.2.1 Unable to connect errors >> >> >> >> Odd errors in my mail queue. Just started appearing yesterday. Most mail >> gets sent, but from certain domains I get these errors. "Attempted failover >> to alternate host, but that did not suceed." Anyone see this before? >> Exchange 2010 on Windows 2008 R2. > >
