safe mail mode

[Pablo Fernandez]

I think it would be nice if clojurewerkz mailer implemented a safe mail mode in which a white listed set of email addresses are sent emails too and the rest are re-written so that a different email address receives those emails.

This is useful for development and staging environments where you want to deliver emails but you don't want to accidentally deliver a real user. There are some libraries that do that in other programming languages already, like: https://github.com/myronmarston/mail_safe

I think if this feature is implemented directly into mailer it'll be much cleaner and safer than a wrapper.

[Pablo Fernandez]

I can give it a go at building this if it's something you are likely to accept.

[Michael Klishin]

Sounds good. Please put together some code examples of what it would look like before putting more time into it. Thank you!