So how much do you know about spam filters? You may be surprised how much detail each different filter is now reviewing:
There is a whole section dedicated to specifics and types of spam filtering within Wikipedia’s pages. And what you don’t know about Bayesian Spam Filtering, could get your marketing email sent to the spam/bulk folder’s at your client’s ISP. Just a few examples to look for:
So it all comes down to one point in email deliverability and Spam Filters. As Filters get more sophisticated, it means less emails make it to the inbox, so know what you’re up against.