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.
|SPF, EXCHANGE, ACTIVE DIECTORY||5||25|
|Installing Exchange 2016||2||24|
|Exchange 2010. 403 error. activesync not working for some users.||6||18|
|external emails from exchange 2013 bouncing back Remote Server returned '550 #5.1.0 Address rejected||13||27|