I would like to alter the Message-ID header that is in the header portion of an email sent from a Ruby on Rails v3 application using ActionMailer.

I am using Sendmail on localhost for mail delivery.

Do I configure this in Sendmail or ActionMailer?

Where do I configure this (if it is ActionMailer): a file in config/ folder or a file in app/mailers/ folder?

ruby-on-rails-3 actionmailer email-headers rfc5322
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