[shin0r]

Hi all

The problem stems from the amount of ntlworld customers that got infected by the last round of viruses (i forget which one sent spam to everyone in the address book, but it was one of them.)

AT&T, ntl, BT, most ISPs in fact have auto-generated spam filters / block-drop lists on their MTA servers - in this case AT&T's dropper has triggered and is now blocking from mta2 (and probably the other MTA boxes within ntl's range.)

Unfortunately the solution, although simple, will be difficult to implement due to the amount of traffic postmaster and root accounts recieve (often admins drop these straight to /dev/null). AT&T will need to remove the ntlworld MTAs from it's drop/block list.

How do you get this done? The most effective way of doing it would probably be to try calling your ntl tech support line who will raise an issue with their sysadmins, who will then raise it with AT&T admins, who will (eventually) drop the MTAs.

HTH