The Resent-Cc field inherits resent-cc StructuredField and handles the Resent-Cc: header field in the email.
Sending resent_cc to a mail message will instantiate a Mail::Field object that has a ResentCcField as its field type. This includes all Mail::CommonAddress module instance metods.
Only one Resent-Cc field can appear in a header, though it can have multiple addresses and groups of addresses.
mail = Mail.new mail.resent_cc = 'Mikel Lindsaar <mikel@test.lindsaar.net>, ada@test.lindsaar.net' mail.resent_cc #=> ['mikel@test.lindsaar.net', 'ada@test.lindsaar.net'] mail[:resent_cc] #=> '#<Mail::Field:0x180e5e8 @field=#<Mail::ResentCcField:0x180e1c4 mail['resent-cc'] #=> '#<Mail::Field:0x180e5e8 @field=#<Mail::ResentCcField:0x180e1c4 mail['Resent-Cc'] #=> '#<Mail::Field:0x180e5e8 @field=#<Mail::ResentCcField:0x180e1c4 mail[:resent_cc].encoded #=> 'Resent-Cc: Mikel Lindsaar <mikel@test.lindsaar.net>, ada@test.lindsaar.net\r\n' mail[:resent_cc].decoded #=> 'Mikel Lindsaar <mikel@test.lindsaar.net>, ada@test.lindsaar.net' mail[:resent_cc].addresses #=> ['mikel@test.lindsaar.net', 'ada@test.lindsaar.net'] mail[:resent_cc].formatted #=> ['Mikel Lindsaar <mikel@test.lindsaar.net>', 'ada@test.lindsaar.net']