In this post, I'm going to tell you two different ways to check
if your ISP is blocking outbound smtp port 25 .  The Easy way:
1. From your browser go to 2. Click "Start Test"  The web app
basically attempts to establish a connection from your computer
to outbound port 25, and tells you if the connection was
successfully established.  The Windows way:  1. Press "Start"
type "cmd" and click on it. 2. Type telnet 25 3. If you get a
response similar to "" then your ISP is not blocking outbound
port 25  This is similar to the previous method but uses the
windows telnet client to check port 25 accessibility.