I am working with email gateway to send our marketing emails. Often I have seen many refusals due to bad content formatting. My emails are categorized as SPAM by ISP.
We have drupal content management system and an add on to send mass emails , I am rying to use SPAM check sites as below. Somehow it's not working for me, these sites return same spam score for any of email.
Does anyone know a good freeware email spam checking gateway.