fetch(set, attr)
Instance Public methods
Sends a FETCH command to retrieve data associated with a message in the
mailbox. The set parameter is a number or an array of numbers
or a Range object. The number is a message
sequence number. attr is a list of attributes to fetch; see
the documentation for Net::IMAP::FetchData for a list of valid attributes.
The return value is an array of Net::IMAP::FetchData. For example:
p imap.fetch(6..8, "UID")
#=> [#<Net::IMAP::FetchData seqno