I tested and debugged throughoutly my ol' patch and I found it useable. This patch's goal is to use the sendmail-interface rather than use the SMTP port managing to send letters. This method is much more effective when the SMTP server itself is in the local machine. (due of the latency of establishing a socket)
In the attachment there's the latest patch. "Save it, patch it, try it, apply it" ("Hold Me, Thrill Me, Kiss Me, Kill Me").