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.
The ISP's "Mail Delivery Subsystem" (Sendmail-Pro?) invariably
autoresponds with an error message that seems to show the cc line
split irregularly -- not at a comma. Two examples:
"Host unknown (Name server: axe.humboldt1.edu,levinel: host not
"... (Name server: telis.org,: host not found"