method
set_content_type
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Class: ActionMailer::Base
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set_content_type(m, user_content_type, class_default)
protected
Used by #mail to set the content type of the message.
It will use the given user_content_type, or multipart if the mail message has any attachments. If the attachments are inline, the content type will be “multipart/related”, otherwise “multipart/mixed”.
If there is no content type passed in via headers, and there are no attachments, or the message is multipart, then the default content type is used.