docs, clarify usage of action_mailer.default_options
. [ci skip]. Closes #13820.
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@ -413,10 +413,18 @@ There are a number of settings available on `config.action_mailer`:
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* `config.action_mailer.default_options` configures Action Mailer defaults. Use to set options like `from` or `reply_to` for every mailer. These default to:
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```ruby
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:mime_version => "1.0",
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:charset => "UTF-8",
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:content_type => "text/plain",
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:parts_order => [ "text/plain", "text/enriched", "text/html" ]
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mime_version: "1.0",
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charset: "UTF-8",
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content_type: "text/plain",
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parts_order: ["text/plain", "text/enriched", "text/html"]
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```
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Assign a hash to set additional options:
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```ruby
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config.action_mailer.default_options = {
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from: "noreply@example.com"
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}
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```
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* `config.action_mailer.observers` registers observers which will be notified when mail is delivered.
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