On 20 February 2015 at 13:55, Randy Jonasz <rjonasz@gmail.com> wrote:
Thanks Steve! That's the problem. I can telnet to my ISP's smtp server but not any other.
Now I'll have to phone my ISP when I get home and have them change their port blocks. Wish me luck.
"Open port 25" disappeared at around the time of the Code Red worm (http://en.wikipedia.org/wiki/Code_Red_%28computer_worm%29) When infected hosts sending out spam got to be a gigantic plague, it became common for ISPs to block port 25 to cut down on the amount of spam they were forwarding. I seriously doubt that your ISP will be willing to change their port blocks. They will most likely say something about "blah, blah, security best practice." An actual reference to claimed security best practice is thus: <https://www.m3aawg.org/sites/maawg/files/news/MAAWG_Port25rec0511.pdf> -- When confronted by a difficult problem, solve it by reducing it to the question, "How would the Lone Ranger handle this?"