Help! Smtp problems, can't send email

Hi,
Right I have been using Mail version 1.3.11 (v622/623)
for a long time and all of a sudden about 2 weeks ago it starts timing out when sending email. Restarting mail or the computer doesn't change it however it did work once randomly within this 2 weeks!
I have tried a few things like changing the port from 25 to 527 (or whatever it is, can't remember offhand) and even from a different computer. I have tried pinging the server smtp.mac.com from both computers with no luck also.
I haven't bothered with apples help yet as the last 2 questions I had took over 3 weeks to answer. So any help would be fantastic!
I'm using OS 10.3.9 on a 1.5Ghz powerbook, and the email account is a .mac one if that's any use.
Thanks for any assistance...

OK. Finally solved the problem. It is not related to network. I have been having this problem with a number of people on different ISP's.
Here's the scoop. Several ISP's have stopped allowing anonymous relaying on their smtp servers in an effort to improve security. And without warning, a couple of them changed the authentication methods. Initally I dismissed the problem as an authentication problem because the apple mail program feedback says TIMEOUT, not rejected password or ID, which led me to beleive this was a network/port problem.
Some require just a user id, some require id with a password. So, like an idiot I just assumed that since I haven't changed any settings for authentication the answer was not there. But I was wrong. If you authenticate to the smtp server using your mail id and password (should be the same for incoming mail) you should be now able to send. Once I fixed this on all the computers, mail started going through without rejection.
Sometimes it takes a few tries for the mail to actually get accepted, but once you hear that lovely jet sound, you know you've got it.
I'll check back soon to answer any questions you may have.
I'm sorry it took so long to post a solution but other problems have taken precedence.

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