feature/email

[hayatesa]

• Optimize print format
• Add e-mail (SMTP) module and config items (Cannot ensure availability under python2). It's available to receive an e-mail after updating.

[NewFuture]

It's a good idea to send email on IP changed.
And I think it will be better to use this mail(smtp service) as a new special DNS provider (such as email or smtp).
and using the ipv4/ipv6 domain for the receiver email list.