Re: Port 25 blocks

[Jon Mitchiner <jon.mitchiner () GALLAUDET EDU>]

If you are blocking port 25, or you are considering blocking port 25, I
strongly suggest that you have a method in place to monitor any device
that is trying to send e-mails through unauthorized servers.  This is
important, in my opinion, to be able to identify which client(s) may
have viruses on their computer so you can take appropriate action on
those computers.

If something is trying to send emails 100,000s of times a day, there's a
good chance it is infected.

It probably wont be too long before there are viruses that hijack the
SMTP AUTH information from commonly used e-mail programs such as
Outlook, Outlook Express.  Blocking port 25 may not be effective in the
future because more ISPs and Universities are requiring SMTP AUTH to
send e-mails.

Jon Mitchiner
Gallaudet University

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