[exim] Re: headers_add :at_start: in routers

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Author: Ian Z via Exim-users
Date:  
To: exim-users
Subject: [exim] Re: headers_add :at_start: in routers
On Tue, May 14, 2024 at 01:41:28PM GMT, Lena--- via Exim-users wrote:

> > My problem is that I'm aware a message is forwarded only at the
> > routers level (the final destination e-address is taken from
> > /etc/aliases or ~/.forward) and :at_start: option does not seems
> > to work in transports


> In routers place the content you need into address_data


> https://www.exim.org/exim-html-current/doc/html/spec_html/ch-generic_options_for_routers.html


> In the rcpt ACL you should have "require verify = recipient"
> (without callout). After that insert:


>   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

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