Urgent question - Does somebody has experience with : , ; - () / & .... in the Subjectline? I guess # are not a good idea to puh due to
spam filter but how about the otheres? thanks for your feedback
IMO, special characters are pretty big red flags for spam filters altogether.
If you really feel like you need special characters in your subject line and want real results, do some A/B testing.
You know I don't have any metrics on this but we often use "," and ":" and "-" in our email subject lines. I will add this to my list of things to investigate in our email metrics.
I will be putting together a much longer post on this soon, but preliminary results from our May promotional email analysis indicate not much of a difference in the subject lines: