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From: Maximiliano Sandoval <m.sandoval@proxmox.com>
To: pmg-devel@lists.proxmox.com
Date: Tue, 27 Feb 2024 11:33:35 +0100
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Subject: [pmg-devel] [PATCH pmg-docs v2] dkim: document dkim_use_domain
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Signed-off-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
---
Differences from v1:
- Add links to RFCs
- Use `+` for new lines in the same section
asciidoc/asciidoc-pmg.conf | 3 +++
pmgconfig.adoc | 12 ++++++++++++
2 files changed, 15 insertions(+)
diff --git a/asciidoc/asciidoc-pmg.conf b/asciidoc/asciidoc-pmg.conf
index 45ea7dd..6c9f0bb 100644
--- a/asciidoc/asciidoc-pmg.conf
+++ b/asciidoc/asciidoc-pmg.conf
@@ -21,7 +21,10 @@ clamav=https://www.clamav.net[ClamAV(R)]
debian=https://www.debian.org[Debian]
debian_nonfree_archive_area=https://www.debian.org/doc/debian-policy/ch-archive#the-non-free-archive-area[Debian's non-free archive area]
tts=http://www.template-toolkit.org[Template Toolkit]
+smtp_rfc=https://tools.ietf.org/html/rfc5321[RFC 5321]
+rfc_5322=https://tools.ietf.org/html/rfc5322[RFC 5322]
dkim_rfc=https://tools.ietf.org/html/rfc6376[RFC 6376]
+dmarc_rfc=https://tools.ietf.org/html/rfc7489[RFC 7489]
ifndef::docinfo1[]
author=Proxmox Server Solutions GmbH
email=support@proxmox.com
diff --git a/pmgconfig.adoc b/pmgconfig.adoc
index bf3887e..33d35fb 100644
--- a/pmgconfig.adoc
+++ b/pmgconfig.adoc
@@ -585,6 +585,18 @@ Controls whether all outbound mail should get signed or only mails from domains
listed in `/etc/pmg/dkim/domains`, if it exists and `/etc/pmg/domains`
otherwise.
+Select Signing Domain::
+
+Determines whether to DKIM sign emails using the domain found in the envelope
+from or the from header in the body of the email. The envelope from is also
+known as reverse-path, see {smtp_rfc} section 3.3 and {rfc_5322} section 3.6.2.
++
+The envelop from of certain emails, bounces for example, can be empty. In these
+cases it is desirable to sign them using the domain found in the from header.
++
+Additionally, DMARC (see {dmarc_rfc} section 3.1.1) needs the domain found in
+the from header in certain situations.
+
These settings are saved to the 'admin' subsection in `/etc/pmg/pmg.conf`,
using the following configuration keys:
--
2.39.2