I have a client who has SBS 2008 server on-site running exchange server 2007
It came to my attention recently that all their external email was being blocked. The undeliverables show that their IP address was blacklisted. This client has recently been added to SPAMHAUS blacklist.
We had a situation where we were using an outside spam filtering server for inbound email filtering, but had to stop that service because one of their customers had an in-housel SMTP server onsite - that automates delivery of email that was not received by my client - that kept getting their email blocked. Therefore, the client was not receiving any email coming from one of your most important customers
So, in the interim, I am rerouting all the outbound email through another mail server until I get the client IP address off the blacklist
I need to determine what is the best way to find what email address is receiving and sending the Most spam. The plan is to delete email addresses and create new email addresses for those users
Also, what is the best process I need to take to get this particular clients IP address removed from the blacklist