method
headers
v3.2.1 -
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Class: ActionMailer::Base
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headers(args=nil)
public
Allows you to pass random and unusual headers to the new +Mail::Message+ object which will add them to itself.
headers['X-Special-Domain-Specific-Header'] = "SecretValue"
You can also pass a hash into headers of header field names and values, which will then be set on the Mail::Message object:
headers 'X-Special-Domain-Specific-Header' => "SecretValue", 'In-Reply-To' => incoming.message_id
The resulting Mail::Message will have the following in it’s header:
X-Special-Domain-Specific-Header: SecretValue