Is Shaw Cable blocking other SMTP ports?
Saturday, July 28th, 2007For the last 3 days I have not been able to send emails out of my Outlook 2007 on my computer. I could only write emails through my Blackberry (thankfully). I contacted my hosting company Bluefur Hosting, and started troubleshooting. The error I got was that my SMTP server cut off or did not respond.
First it was determined that it was a network issue of some sort, as the problem was consistent with whether I was at home, or at an internet hotspot at the coffee shop. It was not singled out to a specific router or an IP address. Also, when I tested it with my spare laptop with Windows XP and Office 2003 on it, it still gave me the same errors. So my computers were ruled out - 2 computers running on 2 different versions of Office/Windows could not have the exact same problem at the same time.
The next thing to check was the server responsiveness through a more manual mean : telnet.
Get into your command prompt, and type “telnet mail.yourdomain.com 25″ and also do it with port # 26.
In my case, port 25 gave me no response, and port 26 was fine. Hence, somehow port 25 was not working. Bluefur’s response was that both ports 25 and 26 (which are the most common for SMTP ports - POP3 for incoming can usually be found at 110) were responding fine for everybody else, so it must be an ISP blocking port 25 on other SMTPs!!!
My only conclusion is that, for whatever reason, Shaw Cable has cut off connections to ports 25 of all foreign (in other words, self-hosted, instead of using myname@shaw.ca type of emails) servers.
If you are having troubles with this in the BC/AB region of Canada, try changing your port # on Outlook to 26.

