Find a standalone fake smtp server for testing w/o many troubles

[vladdancer]

Something like https://coderwall.com/p/ufjgwa/smtp-server-on-python-for-development-with-storing-emails
http://serverfault.com/questions/207619/how-to-setup-a-fake-smtp-server-to-catch-all-mails
https://www.axllent.org/code/fakesmtp/
https://github.com/Web-Power/phpsmtpd

As an alternative for SaaS https://debugmail.io (working port is 9025)