eMclient inserting numbers into the subject line

I’m trialling eM client in conjunction with Google Apps and I’ve noticed that sometimes when I reply to an email the subject line gets numbers inserted into it.

For example, someone sends me an email with the subject “Testing”. If I reply to this mail, the subject is changed to Re[2]: Testing. If they send me another mail and I reply to that, it becomes “Re[4]: Testing”.

Why does eM client do this and can it be turned off?


I think you can change this functionality by going to Tools -> Settings -> Mail -> Compose.