There is the "X-Priority" header. It takes a numerical value from 1 to 5 where 3 is normal priority and 1 is highest. However, this shouldn't have any effect on the delivery speed. It usually used by mail clients to display an extra icon. There isn't much you can do to control email delivery speed except making sure that your mail server is performing well. Mail is asynchronous.

In reply to Re: Setting priority mail by iburrell
in thread Setting priority mail by kidd

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