[KoRn]

That's exactly right. Someone using an email client from work pulling messages from a different server appear to be spammers. That has been the source of many of a headache for me. If I had my way people at the company would only use their email clients for company email, and would only use their company email for company purposes. Too bad that decision isn't up to me :-(

Most providers have web based email that can be used by their customers.

[dfrussell]

Most providers have web based email that can be used by their customers.

Yes, but this is trivial to circumvent.

[beezdotcom]

Someone using an email client from work pulling messages from a different server appear to be spammers. That has been the source of many of a headache for me. If I had my way people at the company would only use their email clients for company email, and would only use their company email for company purposes. Too bad that decision isn't up to me :-(

You know, if you just kick everyone off the network completely, it's much easier to manage it.