Why can't I connect smtp port 25 telnet?

Hi. I have some space on a unix/linux webserver. I am trying to using a program I created to send mail through the [login to view URL] Everytime I try to log in, it disconnects saying all messages failed to reach the server. I've been trying to figure out the cuase...doesn't appear to be spyware or security settings. A person I was testing with could login to send mail but I can't? This is on multiple accounts too I can't send with (I have another webhosting account I tried, same error) When we use [login to view URL] and try telnet [login to view URL] 25, I can't connect either. HELP! Anyone have any ideas on what could be causing this not to work on my computer?...It worked before, about 3 months ago, and now it wont...I can't send mail through my webserver. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform windowsxp, unix/linux