The biggest challenge in Spam filtering isn't identifying junk email; the difficult part is making sure that you don't delete legitimate email (a false-positive result) in the process.
While this might not sound like an important issue at first, what happens when a prospect, customer or client sends you email that you never receive? Depending on your business, this might simply cause delays in customer service. However, if missing an important message damages the relationship or causes the loss of business, then the cost could be substantial.
While every filtering provider claims very low false-positive rates, independent research has shown that even the better ones still block anywhere from 1% to 2% of legitimate email.
You should know that the minimization of critical false-positives is integrated into the very core functions of the OnlyMyEmail system. Rather than simply looking for a reason to label an email as Spam (what most filters really do) OnlyMyEmail processes each email through multiple analysis engines looking for evidence that a message is legitimate.
We've built our business by more accurately filtering Spam (and not critical legitimate email) than anyone else, and have reduced "critical false-positives" to less than 10 per million emails.
