2 programs stopped sending mail

OK, it looks like I solved both problems.

Turns out that I recently switched from DSL to UVerse and the only the latter has port 25 blocked and I wasn't aware of that.

For some reason 465 did not work either. They unblocked 25 but I'll use 587, which works.

As to the email program, the password got messed up but because it does not display I could not see that.

Thanks for your help.

Port 25 has been blocked by ISP's for years now, due to Spamming. You could use SSL with Port 465, but if you are sending large amounts of mail, you could be blocked, if not on Business service.  You can use port 587, not 465, which is a legacy port.  225 is another, along with 110.  Now of course, this is always Google's smtp server http://kb.siteground.com/article/How_to_use_Googles_free_SMTP_server.html

Per chance, what are these two programs that you are having problems with, and what OS.  Here is some reading for you https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#Ports  http://kb.siteground.com/article/How_to_check_whether_SMTP_port_25_is_blocked.html

Thanks for responding.

I only send a few messages every day.

The 2 programs are PopPeeper, which is a simple email program and Abuse, an older utility that analyzes headers and sends notifications to suspected ISP of spammers.

Regarding PopPeeper: the incoming server is Compuserve's, the SMTP server is my ISP's ATT/Yahoo. It was working fine for years until yesterday, when it stopped for no reason. It now gives me a login error when I send the mail from the Compuserve account, even though it has nothing to do with the Compuserve's servers. Yet it works just fine when I send from any other account through the same SMTP server which is configured the same way, port 465 SSL. This is weird.

Regarding Abuse, it is an older program and it does not have a SSL setting. It was set at port 25 and it was working fine, when a few weeks ago its started failing intermittently. I set it at 465 and it did not work at all. I then reset it back to port 25 and at least one message went through, then the rest wouldn't. The question is can I just select any of the ports you mentioned? AFAIK the ISP instructs to use port 465/SSL.

I would prefer not to change SMTP servers, but rather t

Oops, forgot: I am running Windows XP64

I tried port 587 and got "Send mail could not connect to SMTP server"

I don't know if this is relevant or not. Found this in Help and Support......

Note: AT&T's POP/SMTP settings have recently changed to inbound.att.net and outbound.att.net. However, if you are using the old settings, they will continue to work.

Or so they say.