X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/cd6ab265aa53f6bc030e5dfaf113f45d182be40c..ddd83c1e419a8939d6655fc061de16b271446162:/doc/doc-docbook/spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index d0f310f57..7ef79f0ac 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -972,7 +972,7 @@ User filters are run as part of the routing process, described below.
 .cindex "Darwin"
 .cindex "Cygwin"
 .cindex "exim_msgdate"
-Every message handled by Exim is given a &'message id'& which is sixteen
+Every message handled by Exim is given a &'message id'& which is 23
 characters long. It is divided into three parts, separated by hyphens, for
 example &`16VDhn-000000001bo-D342`&. Each part is a sequence of letters and digits,
 normally encoding numbers in base 62. However, in the Darwin operating
@@ -10694,6 +10694,7 @@ shell must be invoked directly, such as with:
 .code
 ${run{/bin/bash -c "/usr/bin/id >/tmp/id"}{yes}{yes}}
 .endd
+Note that &$value$& will not persist beyond the reception of a single message.
 
 .vindex "&$runrc$&"
 The return code from the command is put in the variable &$runrc$&, and this