I'm a Mac user running OS 10.4.9 and using Mac Mail. When I send an attachment (almost always a photo), the receiver gets two attachments, one of which can usually be opened OK just as I sent it but the second attachment can never be opened. This occurs whather or not I check "send Windows friendly attachment" or whether the receiver is Mac or Windows. This seems to irratate and/or confuse the receiver. It irrates and confuses me too.
What do I have to do to insure that the receiver of my email receives only as many attachments as I send?