You probably already know that one of the most important parts of a marketing email is the subject line.  It has to be interesting enough to grab the reader’s attention, of course, but it also needs to prevent the email from being identified as spam.

Here is a great list from HubSpot of common keywords that get picked up by spam filters.  Our favorite?  ”Notspam”

Which keywords do you find the most surprising?  Do you think about spam filters when creating your marketing emails?