Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
|Exchange 2013, emails with attachments are not sending, but not throwing NDR's||6||33|
|365 Postmaster Spam||2||24|
|Exchange 2007 to 2013 send connector issue||6||21|