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Exchange 2019 SMTP Relay Issue After Adding New Server to Send Connector
I have an Exchange environment with two Exchange 2019 servers — one on-premises (EX01) and the other recently deployed in an Azure VM (EX02). The goal is to eventually decommission the old on-premise...
KonstaUPM Thanks for that extra bit there mate. What could we use in this case to test it out properly to see whether its actually open or closed?
Thanks again!
Curious_Kevin16, as we already mentioned, SMTP port 25 is blocked by Microsoft. You need to submit a request if you have an eligible subscription. However, if you want to confirm whether the port is open or closed, you can use various port checker tools available online. For example, you can use:
- https://canyouseeme.org/
- https://portchecker.co/