Archive for May, 2010

Connection Filtering in Exchange 2003

Sunday, May 2nd, 2010

A client recently had problems with a compromised account being used to send SPAM.  Unfortunately, in this case, the client does not require authenticated SMTP from internal mail clients.  So, at first glance, it appeared that there would be no way to prevent the compromised account from sending (short of blocking his IP on the MTA’s firewall or removing the offending computer from the internal network).