Change e-mail service to Mailgun

[ytzvan]

Due to a recent changes into Mandrill, now Malchimp wants you to use their paid service in order to send transactional e-mail, article here.
I suggest move the default e-mail service to Mailgun.

I can check how this works inside Keystone and make a pull req in the near future.
What do you think guys?

[morenoh149]

I feel like the community is favoring moving to nodemailer #250 let me know if you still want the issue open.

[ytzvan]

@morenoh149 I think nodemailer is a good option, but the easy integration with Mandrill is a great feature. I think we can provide multiple e-mail providers, same as how keystone provides multiple view engines, but this will require more work to do. I'm happy to contribute with this. Maybe you can leave the issue open for a few days in order to know what the community think.

[morenoh149]

I see nodemailer can also be hooked up to mailgn https://github.com/nodemailer/nodemailer#delivering-bulk-mail

[0zguner]

I think we should work on mailgun option.

[0zguner]

The other option is Sparkpost. https://developers.sparkpost.com https://www.sparkpost.com and they love developers

[mxstbr]

Lets close this and track all related questions in #250.