(unknown)

Did that, the message looks OK when presented for approval, then has lots 
of blank lines when delivered.

>> Added clue: some copies have more blank lines than others, which makes no 
>> sense since I use qmail and they should all be sent at once.
> Are the blank lines \n or \r\n or something else?

I believe they're \n which qmail turns to \r\n.

R's,
John