[Exim] Exim4: one_time and headers_add

Hello,

I notice that the one_time router option cannot be used with
headers_add/headers_remove. Can I ask why? We used to use this
combination in Exim 3; it's not a problem as such but originally caused
a problem with our mail queue because all the queued mail had the same
address (@plymouth.ac.uk).


Thanks,

John.
--
John Horne, University of Plymouth, UK       Tel: +44 (0)1752 233914
E-mail: jhorne@???
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