A client of mine is having a problem with receiving 1000s of spam per day.
We have SBS pop collector configured to receive email from the hosting server every 5 minutes.
The problem is we are receiving lots and lots of spam each day. We have spam assassin enabled on the hosting server and the local exchange server has Eset mail security for exchange. The stats on the Eset is showing email being rejected every 30 seconds.
The strange thing is is that when I login to the webmail on the hosting server I cannot see these spam emails. I have checked the headers of the emails and it's showing as hitting the cpanel.
I have disabled port 25 on the router and changes the receive connector in exchange to download retrieve email from the pop3 hosting IP address.