Proposal: Making [ActionMailer::Base] an optional dependancy

[clowder]

We currently have no requirement for ActionMailer in our app, and like to run as lean a stack as possible – requiring components independently rather than using Rails.all.

Unfortunately though, because eager loading, using Clearance requires that we also include ActionMailer – even though we're sending all our mail through Mandrill.

I would like to propose that we soften the dependency on ActionMailer and also make the API for subbing out the mailer part of Clearance's config.

Happy to do the work to get this production ready, but want to float the idea before going too far down the rabbit hole.

[derekprior]

I'm hesitant to make this a configuration. I'm more inclined to be in favor of a guard clause in the default deliver_email method... something to the effect of return unless defined?(::ClearanceMailer)?