fix mm domain

lib/submissions.rb

@@ -107,6 +107,7 @@ module Submissions
     return email.downcase if email.to_s.include?(',')
     return email.downcase if email.to_s.include?('.gob')
     return email.downcase if email.to_s.include?('.om')
+    return email.downcase if email.to_s.include?('.mm')
     return email.downcase unless email.to_s.include?('.')
 
     fixed_email = EmailTypo.call(email.delete_prefix('<'))