>For some reason my ISP's mail server is not accepting multiple cc's
>from PC-Yarn, though there is no problem via Eudora. I believe the
>cc's are properly formatted, with a comma between each (plus a
>space), and subsequent lines indented. For what it's worth the
>uploads are done with the UKA_PPP SMTP client.
I used UKA_PPP 1.5 for a long time, 1.6 only
experimentally, so this might not apply to the current
version. But the older versions could only handle one
recipient on each header. I had to use multiple Cc headers
to get the job done, which was kind of a headache. Most
SMTP hosts will accept up to 99 or so Cc headers.