Method not available on this version
This method is only available on newer versions.
The first available version (v8.1.1) is shown here.
reply_to_address()
public
No documentation available.
# File actionmailbox/lib/action_mailbox/mail_ext/addresses.rb, line 9
def reply_to_address
address_list(header[:reply_to])&.addresses&.first
end