troubleshooting Question

Mail not going out to certain domains

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EmpireAeroCenter asked on
SoftwareExchangeEmail Protocols
5 Comments1 Solution322 ViewsLast Modified:
We recently switched ISPs and started having issues with email going out to certain domains.  It will just sit in queue. an SMTPdiag /v  on these domaines show the following.

Error: Expected "220". Server is not accepting connections.
Failed to submit mail to
Connecting to [] on port 25.
Connecting to the server failed. Error: 10060
Failed to submit mail to

Everything I have found online referes to a reverse DNS issue,  I have repeadadly verified that our DNS records are setup properly with the new ISP.  Does anyone have any other suggestions what it could be?
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