[exim-cvs] Docs: add note on DKIM vs. tpt modifying headers

Gitweb: https://git.exim.org/exim.git/commitdiff/4341239037d5aac10b785f60f0e78570ab4ddebb

Commit:     4341239037d5aac10b785f60f0e78570ab4ddebb
Parent:     d4ff6d2a25234f7558baa99a54ca138c3f004b06
Author:     Jeremy Harris <jgh146exb@???>
AuthorDate: Sat Mar 9 16:30:43 2024 +0000
Committer:  Jeremy Harris <jgh146exb@???>
CommitDate: Sat Mar 9 18:51:08 2024 +0000

    Docs: add note on DKIM vs. tpt modifying headers
---
 doc/doc-docbook/spec.xfpt | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

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

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