Why does Pine use Base64 instead of UUencode?
Pine uses the Internet MIME (Multipurpose Internet Mail Extensions) standard for all attachments. MIME uses “Base64” encoding rather than uuencode, because uuencode uses characters that are transformed by some email gateways, and there are also several incompatible versions of uuencode. However, if needed, you can certainly uuencode a file outside of Pine, then use the Composer’s “file inclusion” (^R) command to insert the uuencoded file into the message.