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Originally Posted by Dooby
even a standard mail program sends email by connecting out on the SMTP port, blocking port 25 would result in noone being able to send email (unless they used a webmail client or something )
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NTL could block incoming port 25 to customers and no one, apart from people like myself running their own mail server, would know or care.
Also blocking outgoing port 25 is feasible providing that they undertook some form of packet filtering to allow port 25 traffic to their own mail servers but no where else.
I don't think the NTL network is so advanced as to allow this sort of filtering but if it is then theoretically they could do it without affecting 99% of their customers.