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