Do I use smtp.mydomain.com or mail.mydomain.com to send emails from my third party application?
I have SBS server and exchange is working as it should, we use a third party application which sends emails to clients with a PDF invoice. There are no notes.
If I use smtp and smtp.gmail.com port: 587 the emails work but if I use smtp mail.mydomain.com port 25 it does not work. Port 25 is open.
Should I be using smtp.mydomain.com port 25?
Apologies if its a dumb question.