I have spent the last few days working really hard on the spec sheet of an email solution for XRMS. As it turns out, what I envisioned is a small but highly functional built-in email client inside XRMS. Let the idea or the length of the document not scare you. The concept is actually very simple but I have been as detailed as time and energy allowed to write this out. Please note that the parts highlighted in yellow are the items I am not quite sure about or do not know enough about to even make a competent statement.
This is more than just a rough draft and, while I am still polishing the concept, it should probably give you a very good idea what I have in mind. I will start a thread in Open Discussion pointing to this Feature Request and I would greatly appreciate your feedback on it since there is some money available and the willingness to make this happen.