The most successful thing we did was a process called filtering. The first time we experimented with this we made some mistakes and lost some business along the way.
We were filtering too much. Even the legitimate emails were getting blocked.
We eventually found a software called MailWasher that allowed us to set very specific filters so that only true spam would get blocked.
The beauty of it was that it let us see the spam before it downloaded to our computers and if we wanted to we could mark certain email as spam and allow the program to learn what to block.
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