.option dkim_canon smtp string&!! unset
.option dkim_strict smtp string&!! unset
.option dkim_sign_headers smtp string&!! unset
+.option dkim_hash smtp string&!! sha256
DKIM signing options. For details see section &<<SECDKIMSIGN>>&.
&`SNI `& server name indication from TLS client hello
&`ST `& shadow transport name
&`T `& on &`<=`& lines: message subject (topic)
+&`TFO `& connection took advantage of TCP Fast Open
&` `& on &`=>`& &`**`& and &`==`& lines: transport name
&`U `& local user or RFC 1413 identity
&`X `& TLS cipher suite
signature.
When unspecified, the header names recommended in RFC4871 will be used.
+.new
+.option dkim_hash smtp string&!! sha256
+Can be set alternatively to &"sha1"& to use an alternate hash
+method. Note that sha1 is now condidered insecure, and deprecated.
+.wen
+
.section "Verifying DKIM signatures in incoming mail" "SECID514"
.cindex "DKIM" "verification"