Unable to access my smtp server from a remote host due to ports being blocked?
in [Sendmail]
|
Prev: Usermail.com Problem
Next: Unable to access my smtp server from a remote host due to ports being blocked?
From: Mark Hansen on 15 Mar 2010 12:44 I am running sendmail 8.1.13.8 on a CentOS 5.4 Linux host. I've configured the server to listen on port 587 using SMTP Auth, etc. so that I can connect from my laptop while working remotely. This has been working for years. However, I tried to set up an e-mail client on my Wife's computer at your office in a school system (a local K-12 system) and she is not able to connect to the smtp service on port 587. I had her try using telnet to connect directly to the host/port, but it appears to be getting blocked on her end. I thought the IT folks may just be blocking port 587, so I changed by server to use port 589 instead. Although I was able to connect to it on that port, she still was not. I doubt very much the school IT folks would be willing to open the port for her, as I expect this is a spam prevention measure. I'm wondering if it's possible to use a port for the smtp server which the school is not likely to have blocked? I know they don't block everything, as she is able to talk to our IMAP server via port 993, so it must not be blocked. Is there a port range which I can use for my smtp server which they are likely not to have blocked? Thanks, |