[exim] Re: headers_add :at_start: in routers

[Anton via Exim-users]

Ian Z via Exim-users wrote on 14-05-24 19:12:

   warn condition = ${if def:address_data}
        add_header = :at_start:X-Forwarded-For: $address_data

Clearly this solution is only valid if the add_header action is
"lazily evaluated" i.e. delayed until actual delivery. Is that the
case?

Ian,

you have two ACL rules, first one (verify recipient) "fills" the $address_data,
the second rule (above) just checks if there is any data in the variable.

A.

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