unsubscribe.rb

class ActionMailer::Base
  @@name_regex = '[\w\.%\+\-]+'.freeze
  @@dom_head_regex = '(?:[A-Z0-9\-]+\.)+'.freeze
  @@dom_tld_regex = '(?:com|org|net|edu|gov|mil|biz|info|mobi|name|aero|jobs|museum|[A-Z]{2})'.freeze
  @@carated_regex = /\A.*<\s*(#{@@name_regex}@#{@@dom_head_regex}#{@@dom_tld_regex})\s*>.*\z/i
  @@uncarated_regex = /\A\s*(#{@@name_regex}@#{@@dom_head_regex}#{@@dom_tld_regex})\s*\z/i
 
 def valid_recipient(s)
  addr = $1 if s=~@@carated_regex || s=~@@uncarated_regex
  addr && Unsubscribe.find_by_email(addr).nil?
 end
 
 def valid_recipients(recipients_str)
  recipient_list = []
  recipients_str.split(",").each{|r| recipient_list << r if valid_recipient(r)}
  recipients recipient_list.join(",")
 end
 
end