class Net::IMAP::Address

field holds the group name phrase.
non-NIL, this is the start of a group marker, and the mailbox #name
marker (semicolon in RFC-822 syntax). If the #mailbox name field is
syntax. If the #mailbox name field is also nil, this is an end-of-group
that indicates the [RFC5322] group
When the #host field is nil, this is a special form of address structure
== Group syntax
returned within Envelope fields.
parsed into its component parts by the server. Address objects are
Net::IMAP::Address represents an electronic mail address, which has been