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Add ability to define callbacks in ActionMailer using AbstractControl…
…ler::Callbacks. Prior to this commit, there isn't a good way of adding things like default inline attachments to an email. This Stack Overflow thread shows people using hooks like the 'default' method in ActionMailer::Base to call a Proc for message configuration: http://stackoverflow.com/questions/5113121/rails-use-same-attachment-for-all-emails-using-layout This has the unintended side effect of setting a message header, so it's not a good solution. This pull request adds support for message modifications by including AbstractController:Callbacks in ActionMailer::Base. It includes tests and documentation for the functionality provided by including this module.
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