>IMHO, there should be a solution in the way
>messages are posted in the UT, so a user doesn't
>have to face the problem of finding what MTU his
>ISP has, and how to change the one on his own
>machine. Is it possible do addopt e-mail in some
>way for sending the messages to the UT ?

There is nothing we can do on our site. Please, call your ISP and ask them for this MTU value so you can adjust it. I can't be sure at 100% that this will fix the problem. We also faced that some ISP are using old non standard technology for their com servers.