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update the Readme #1

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update the Readme #1

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12 changes: 12 additions & 0 deletions README.md
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Expand Up @@ -46,6 +46,18 @@ mail.deliver some_message

mail.use :null # switch back to the null implementation.
```
Sometimes you'll want to use an implementation for the duration of a block:

```
mailer = Mailer.new
mailer.register :snail_mail, SnailMail.new

mailer.with(:smtp) do |smtp_mailer|
smtp_mailer.deliver some_message
end

mailer.deliver some_message_with_snail_mail
```

These objects are useful when you have an interaction that needs
to happen but implementations can vary widely. You can also use this
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