Catch/display local mails

[tylerflint]

From @mbrodala on November 30, 2016 13:33

With our current Vagrant setup we automatically install and run MailHog locally and instruct the system to use it as sendmail binary. This way outgoing mails are caught by MailHog and can be inspected.

It would be great if Nanobox had something similar to catch outgoing mails when running locally. I could imagine this as another data component or similar but I'm not sure how to skip a component in production which would be essential here.

Copied from original issue: nanobox-io/nanobox#274