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Exchange Yahoo.com, Rogers.com, Yahoo.ca cant send mail to them

Hey Guys.

Not sure whats up here My exchange server can deliver mail to the about mentioned domains.

It sits in the queue for a few days then I get a 4.4.7 error saying

This is an automatically generated Delivery Status Notification.

"Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server."

Where should i Start o troubleshoot this issue?

ExchangeSBSEmail Servers

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Last Comment

8/22/2022 - Mon