====== Email ======
  * [[email:emailservice|Email Service]]
  * [[google:gmail|Google Gmail]]
  * [[email:claws_mail|Claws Mail]]
  * [[email:mailspring|Mailspring]]

====== Email Testing ======
  * https://mailtrap.io
  * https://putsmail.com
  * [[https://www.mailpoet.com/blog/email-testing-tools/|20 Best Email Testing Tools - MailPoet]]

===== 암호화 =====
  * [[http://code.tutsplus.com/tutorials/its-time-to-encrypt-your-email--cms-23719|It's Time to Encrypt Your Email]]