Know-How Exchange : E-Marketing

Does anyone know of a comprehensive list of trigger words to avoid in the subject line of my email blast, or good tools to run my email through? I see various lists when I do web searches, but they usually contain the more obvious words/phrases to avoid (ex. save $$). Someone also suggested the tool https://spamcheck.sitesell.com/ for checking my emails. I am wondering if there are other good ones (preferrably free or low cost). Thank you!