Clarify interaction of delay_warning and retry configuration.

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 5f1c25f41f0f12635e1f692aa59bb3dd95d059e2..17bdcc943a6b3a2bc3a668a5a5fc8971a7a2efe4 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -13652,6 +13652,9 @@ a very large time at the end of the list. For example:
 .code
 delay_warning = 2h:12h:99d
 .endd
+Note that the option is only evaluated at the time a delivery attempt fails,
+which depends on retry and queue-runner configuration.
+Typically retries will be configured more frequently than warning messages.
 
 .option delay_warning_condition main string&!! "see below"
 .vindex "&$domain$&"