OT Anyone know anything about error messages?

[networkman]

[ QUOTE ]
The company/person you're sending email to is using a DNS blackhole list (likely the RTBL see http://rbls.org/ if you're listed) and you (or your ISP) are on it as a potential/known spammer/abuser.

Try signing up for gmail or another webbased provider to get through to them if email is the only way you can get in touch with them.

[/ QUOTE ]

Yeah, what he said