Thanks Jimuni, your points make sense and were expected. I just want to make sure that I can send that size if necessary, normally there is only 3 such mails a month at maximum, they would be legitimate files, mostly translated service manuals I do for our company, ftp or so would make more sense, you are correct however with the people I am dealing with it would just complicate matters, I would expect that you permit such files as .rar .zip and .pdf to be transmitted, executables and script files of course not.
Thanks again.