From: Jeremy Harris <jgh146exb@wizmail.org>
Date: Sat, 9 Mar 2024 16:30:43 +0000 (+0000)
Subject: Docs: add note on DKIM vs. tpt modifying headers
X-Git-Url: https://git.exim.org/exim.git/commitdiff_plain/4341239037d5aac10b785f60f0e78570ab4ddebb

Docs: add note on DKIM vs. tpt modifying headers
---

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index e51e540d9..d030a8411 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -41600,8 +41600,11 @@ Exim's DKIM implementation allows for
 .olist
 Signing outgoing messages: This function is implemented in the SMTP transport.
 It can co-exist with all other Exim features
-(including transport filters)
-except cutthrough delivery.
+(including transport filters) except cutthrough delivery.
+.new
+However, signing options may not depend on headers modified by
+routers, the transport or a transport filter.
+.wen
 .next
 Verifying signatures in incoming messages: This is implemented by an additional
 ACL (acl_smtp_dkim), which can be called several times per message, with