Another reason for keeping e-mail subject lines short and sweet: spam blockers. In trying to block unwanted e-mails, some spam blockers flag questionable subject lines.
For example, try sending anybody an e-mail with a $ symbol in the subject line. That one will never see your in box. A number of spam blockers also don’t take kindly to e-mail with no subject line or short subject line greetings like “Hello.” Also, you’ll want to be careful about sending e-mails with url’s in the subject lines.
While spam blockers are meant to prevent unwanted mail, they sometimes have the same effect on the missives you do want. Sure, you can’t control what people send to you, but you can make sure your e-mails get there by paying more attention to your subject lines.
