Docs: note splitting of long messages for SMTP response

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 62258dd6180ef218e9cb433f327a827bc30bba23..9eb0b6b564eb3be5fe396b880b4be4453114dc54 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -31564,8 +31564,11 @@ the message modifier cannot override the 221 response code.
 
 The text in a &%message%& modifier is literal; any quotes are taken as
 literals, but because the string is expanded, backslash escapes are processed
-anyway. If the message contains newlines, this gives rise to a multi-line SMTP
+anyway.
+If the message contains newlines, this gives rise to a multi-line SMTP
 response.
+A long message line will also be split into multi-line SMTP responses,
+on word boundaries if possible.
 
 .vindex "&$acl_verify_message$&"
 While the text is being expanded, the &$acl_verify_message$& variable