Email Triggers tool that would work on a forwarded email address, see ticket 25057 Re: want a new tool, based on Email Triggers
I want to tag someone when they reply to an email, but I do not like putting your email in the send email.
Part of what I want to do it strengthen the spam problem, so the email needs to come from my domain (also so it will get sent as plusthismail.com is not an accepted email to send from for my domain), and then when they reply, I want to forward to your email, and have you tag the original contact. When they reply to the email, it will tell spam engines that it is an active email, and let it through next time.
Note this will also solve the persons problem that wants plus this to forward the email to them, so this should get their points as well