On (info "(mailutils) Mail Variables")
Letter Meaning
--------------------------------------------------------------------------
%a Message attributes.
%d The date when the message was received. **mention *Note
datefield:: here too**
%f The address of the message sender.
%l The number of lines of the message.
%m Message number.
%o The number of octets (bytes) in the message.
Also here you should also have date(1) % modifiers, as one would
probably not want a one size fits all date style!
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