[Exim] norton av, send a command that exim could'nt understa…

Hello,

Earlier this morning i found out something that, when-ever i click the
option on my outlook to secure port 25 when sending email and i turn on my
nav when i send onto exim, it is being rejected..


-- error --
An unknown error has occurred. Account: 'louie@???', Server:
'172.25.1.1', Protocol: SMTP, Server Response: '500 Unsupported command.',
Port: 25, Secure(SSL): Yes, Server Error: 500, Error Number: 0x800CCC62
-- error --

Any ideas?

Thanks,
Louie