Alias header addition modifiers

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The action of those alias options (Unified Configuration) or alias file named parameters (legacy configuration) that can add headers, e.g., alias options such as alias_deferred or alias_priority, or similarly alias file named parameters [DEFERRED], [PRIORITY], etc., can be modified by the special characters shown in Table of alias header addition modifiers, by appending the special character at the end of the value for the option or parameter.

Alias header addition modifiers
Character Description
  Insert if not already present; inserts as a Resent- if already present
* Only insert if not already present
& Insert if not already present; add to old field if already present
^ Delete any old field present; always insert the new field
\ Delete old field and don't insert a new one

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