SMTP Protocol Authentification

[mindflower]

We have a problem with a Spammer (ab)using our Exchange System.
As soon as I switch the SMTP Protocol Anonymous Authentification off the
spammer is gone, while Mails can be sent from the authorized users, which is
good.
Unfortunately the users cannot receive Emails any more, which i do not quiet
understand. As soon as i switch anonymous SMTP authentification on receiving
Emails works fine again, but the spammer is back.
Any ideas on how to solve that one?

Regards
Stefan

[Paul Ford (Edge IT Ltd)]

Are they spamming your users or are they relaying off your server. If it is
spamming your users then using a third party spam software as well as the
Intelligent Message Filter in Exchange will help.

Regards

Paul Ford
Edge IT Ltd

Post by mindflower
We have a problem with a Spammer (ab)using our Exchange System.
As soon as I switch the SMTP Protocol Anonymous Authentification off the
spammer is gone, while Mails can be sent from the authorized users, which is
good.
Unfortunately the users cannot receive Emails any more, which i do not quiet
understand. As soon as i switch anonymous SMTP authentification on receiving
Emails works fine again, but the spammer is back.
Any ideas on how to solve that one?
Regards
Stefan