Ta Heidi - guess I'll send them a cd in snail mail
Mike

Oh.. and the only 'silly' question is the one you don't ask

Yep it's a smiley day today - most are lol

Hmm.. auto play audio files in an email. That's a curly one Mike! I haven't personally looked into this. It may be possible, but you would be relying on the recipient:
a) having their email program set to receive html emails;
b) allowing automatic downloads of pictures and attachments; and
c) having their speakers turned on!
The audio file would have to be sent as an attachment, so would be say on average 3-5mb plus the size of the email and any other attachments. That's a fair chunk of an email to receive. And most email hubs (ie hotmail, gmail etc) usually have a max limit of 10mb for attachments.
I did a quick Google but did not come up with any answers - though a good few people have asked the same question.
Sorry I couldn't be more help! Dont hesitate to ask any other questions