Encoding property defines encoding algorithm used to
send attachment inside email message. Most common is
BASE64, and is widely used among mail clients. BINHEX4 is
used mostly by Macintosh users, and UU is old algorithm
used among UNIX clients.
wodPop3 will try to find information about encoding from
message headers, if possible. If this information is found,
using Save method will
automatically decode attachment properly and save it to
local file.