Xtra will block email traffic on Port 25 from the end of this month in a bid to cut down on spam and virus-laden emails.
Port 25 is used by the Simple Mail Transfer Protocol, or SMTP, which is commonly used by computers to connect to mail servers to send emails.
It is often used by spammers to send mail either using their own machines or hijacked "zombie" computers, as well as by mass-mailing worms and viruses to spread to other computers.
Not bad, I guess. I was suggesting they pursue this nearly 3 years ago!
Would be interested to see how they implement this, and whether its along the lines I had originally suggested (exceptions only for static IP customers [who can be policed individually as a block-and-exception or allow-and-police as required]).... I still use Xtra as my DSL provider, so the negative here will be an inability to test outbound SMTP to other MX's from home. Still, as a residential customer, thems the breaks... (how much spam comes from haxed boxen on residential links?)
[Edit: See also:
Also found on the Xtra Website:
Xtra will prevent email traffic bypassing Xtra's anti-virus and anti-spam filters by filtering email that is sent using port 25. This measure is to reduce to the amount of spam being received or sent by Xtra customers.