Change SMTP from 25 to 587
Posted on 2010-08-25
I have a two part question:
re: Small Business Server 2003 using exchange 2003
To avoid BOTs and Trojans It's been recommended that port 25 be closed completely and that port 587 be set as the SMTP port.
I know i can change the port by going to Exh System Manager, Server, Protocols, SMTP and properties of Default SMTP VIrtual Server. However I"ve read that changing from 25 to 587 may cause a problem unless 587 is set to listen. Also I've read that a certificate is needed on 587.
Question 1: what is the best way to implement the change to port 587 from port 25. How does one make 587 listen and how does one install a certificate on a port?
Question 2: how can I then shut down all access via port 25 (thru routing table on router?)