[Exim] Access to the "yield" of lookup

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Autor: steven
Data:  
Para: exim-users
Assunto: [Exim] Access to the "yield" of lookup
In a router I wish to access the results of a lookup by using a sequence like

condition = ${lookup pgsql{select ...
header_add = X-Aheader : $value

Can someone tell me if this is possible.

Steven