I want to allow email for a special group only, if the mail
- ist smaller than 20 MB
- has no attachements
- has one or more attachements of an allowed type (pdf, doc, xls, ...)
All other attachements should be forwarded to an administration account. The attachement should then be stripped off the mail and the user should get the mail with the information, that he could get the mail, if it is business relevant.
My problem is, that I don't know how to filter emails without an attachement.