I use Hotmail for my emails and often send/forward items to friends on AOL. Everything was fine till recently when I started getting 'Non Delivery' messages. They are as follows; 'Unable to deliver message.... Diagnostic Code;smtp;500 SYNTAX ERROR, COMMAND UNRECOGNISED LINE BY ITSELF.
I am running XP Pro and have made no changes to my system. Can anyone shed any light on this please?
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