I am using CMS Mailer for E-mail sending in my site (PHP based module). It worked perfectly till I changed my server and also location of whole website.
It's working now, but seems there appeared bugs like: missing reply data for people i.e. who want to answer to my letter , they need to enter it with their hands, but normaly it must be filled automaticly.
Normaly, when you press "Reply" to letter, it brings letter form, with filled fields (To, Subject...), but in my case "To" is missing.
I searched code (which wasn't modified from time, when mailer worked perfectly, till now), information for reply is hold in "header". I also checked server mail setting, chmod. So, where could be a problem, when only server place was changed, but no source code edited, event latest CMS Mailer version was downloaded in process of seaching problem?