There is a debate going on in the world of email marketing concerning the word "free". I suspect this is because direct mail writers have been using this word successfully for years, so why not in email as well?
But, as I have pointed out, email marketing is setting its own rules. Email is a relationship, not an advertising media. And, while we have all accepted advertising and direct mailings mixed with our regular mail, we are not so willing to yield ground in our email inbox
I suggest you keep the word "free" out of the SUBJECT field, and use it only once or twice in the body of your email marketing message — and only when appropriate. Try alternatives like "no cost" and "complimentary".
Conclusion - Keep the word "free" out of the SUBJECT field, and use it only once or twice in the body.
Try alternatives like "no cost" and "complimentary" for a change.
source : Mailworkz.com
