Docs: tweaks

[exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 4069c29dbb5300d0f54e9773185b1dd51a65db72..f1940bb1ef31b9057c177f7130b13dca5aa79f13 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -6641,6 +6641,8 @@ file that is searched could contain lines like this:
 .endd
 When the lookup succeeds, the result of the expansion is a list of domains (and
 possibly other types of item that are allowed in domain lists).
+.cindex "tainted data" "de-tainting"
+The result of the expansion is not tainted.
 
 In the second example, the lookup is a single item in a domain list. It causes
 Exim to use a lookup to see if the domain that is being processed can be found
@@ -15631,6 +15633,10 @@ and RET and ORCPT options on MAIL FROM commands.
 A NOTIFY=SUCCESS option requests success-DSN messages.
 A NOTIFY= option with no argument requests that no delay or failure DSNs
 are sent.
+.new
+&*Note*&: Supplying success-DSN messages has been criticised
+on privacy grounds; it can leak details of internal forwarding.
+.wen
 
 .option dsn_from main "string&!!" "see below"
 .cindex "&'From:'& header line" "in bounces"
@@ -25672,7 +25678,7 @@ The &%tls_verify_certificates%& option must also be set.
 If both this option and &%tls_try_verify_hosts%& are unset
 operation is as if this option selected all hosts.
 
-.option utf8_downconvert smtp integer&!! unset
+.option utf8_downconvert smtp integer&!! -1
 .cindex utf8 "address downconversion"
 .cindex i18n "utf8 address downconversion"
 If built with internationalization support,
@@ -25680,7 +25686,8 @@ this option controls conversion of UTF-8 in message envelope addresses
 to a-label form.
 If, after expansion, the value is 1, 0, or -1 then this value overrides
 any value previously set for the message.  Otherwise, any previously
-set value is used.
+set value is used.  To permit use of a previous value,
+set this option to an empty string.
 For details on the values see section &<<SECTi18nMTA>>&.