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`mail()` without arguments is a getter for the current mail.
This behavior is documented in our guides (http://edgeguides.rubyonrails.org/action_mailer_basics.html#action-mailer-callbacks) but was broken in the past. This commit short curcuits the `mail` method if: 1. mail() was previously called 2. no headers are passed 3. no block is passed Closes #13090. /cc @pixeltrix Conflicts: actionmailer/CHANGELOG.md
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