>>>Which firewall did you turn off? You may have 2 firewalls, Windows and in your office router
>>>Also your ISP may block port 25 to prevent outbound mail spam
>>>
>>
>>Good thinking. I'd turned off the Windows firewall. As far as I can tell, my router has only an inbound firewall, not an outbound one.
>>
>>But your other idea got to me run a port checker and sure enough, port 25 is closed. So now I have to figure out if I can open it, and if not, what else I could do to test this code (since port 25 isn't essential to the project, just to the approach I was trying to use for testing).
>>
>
>Usually, ISP provide their own SMTP server when they block port 25.
>Also, if you have business account, most likely you can ask them to unblock it

I gave up on using that SMTP test server that uses port 25. Tried again with my Exchange server and got farther, but had authentication issues. Next, I'm going to try with one of my various other email addresses that may make things simpler.

Tamar