[pmg-devel] [PATCH pmg-docs] close #2449: clarify DNSBL check in SMTP Whitelist

[Mira Limbeck]

Rename RBL in the context of the SMTP Whitelist to DNSBL for
consistency. The Mail Proxy Option is already named DNSBL
Sites/Threshold and the postfix option also contains 'dnsbl', not 'rbl'.

The description of the SMTP Whitelist is not exactly clear because for DNSBL
checks postscreen is used which only supports 'IP Address' and 'IP
Network' entries.

Signed-off-by: Mira Limbeck <m.limbeck at proxmox.com>
---
It might still not be clear what exactly the difference between the SMTP
Whitelist, the Rule Whitelist and the User Whitelist is, I'll work on
adding a comparison or so to the docs as well.

 pmg-intro.adoc | 2 +-
 pmgconfig.adoc | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/pmg-intro.adoc b/pmg-intro.adoc
index 873c9be..20d5422 100644
--- a/pmg-intro.adoc
+++ b/pmg-intro.adoc
@@ -50,7 +50,7 @@ lists of addresses linked to spamming.
 SMTP Whitelist::
 
 Exclude senders from SMTP blocking. To prevent all SMTP checks
-(Greylisting, Receiver Verification, SPF and RBL) and accept all
+(Greylisting, Receiver Verification, SPF and DNSBL) and accept all
 e-mails for the analysis in the filter rule system, you can add the
 following to this list: Domains (Sender/Receiver), Mail address
 (Sender/Receiver), Regular Expression (Sender/Receiver), IP address
diff --git a/pmgconfig.adoc b/pmgconfig.adoc
index 2ac8a84..78bece2 100644
--- a/pmgconfig.adoc
+++ b/pmgconfig.adoc
@@ -426,11 +426,17 @@ image::images/screenshot/pmg-gui-mailproxy-whitelist.png[]
 endif::manvolnum[]
 
 All SMTP checks are disabled for those entries (e. g. Greylisting,
-SPF, RBL, ...)
+SPF, DNSBL, ...).
+
+DNSBL checks are done by `postscreen` which works on IP addresses and networks.
+This means it can only make use of the `IP Address` and `IP Network` entries.
 
 NOTE: If you use a backup MX server (e.g. your ISP offers this service
 for you) you should always add those servers here.
 
+NOTE: To disable DNSBL checks entirely, remove any `DNSBL Sites` entries in
+xref:pmgconfig_mailproxy_options[Mail Proxy Options].
+
 
 [[pmgconfig_spamdetector]]
 Spam Detector Configuration
-- 
2.20.1