Docs: clarify notes on Events

[exim.git] / doc / doc-txt / experimental-spec.txt

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index d446f6b67716c19932c4e29cf4f85d6f5f48d231..f0c6d95ba70699ea71f5c1fe508c780b9de5ca39 100644 (file)
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -795,8 +795,10 @@ expansion is done.  The current list of events is:
  smtp:connect          after  transport  per connection
 
 The expansion is called for all event types, and should use the $event_name
-value to decide when to act.  The variable data is a colon-separated
-list, describing an event tree.
+variable to decide when to act.  The value of the variable is a colon-separated
+list, defining a position in the tree of possible events; it may be used as
+a list or just matched on as a whole.  There will be no whitespace.
+
 
 There is an auxilary variable, $event_data, for which the
 content is event_dependent:
@@ -855,7 +857,7 @@ No other use is made of the result string.
 Known issues:
 - the tls:cert event is only called for the cert chain elements
   received over the wire, with GnuTLS.  OpenSSL gives the entire
-  chain including thse loaded locally.
+  chain including those loaded locally.
 
 
 Redis Lookup
@@ -1271,8 +1273,9 @@ $tls_out_tlsa_usage (detailed above).
 
 
 
-SMTPUTF8
+INTERNATIONAL
 ------------------------------------------------------------
+SMTPUTF8
 Internationalised mail name handling.
 RFCs 6530, 6533, 5890
 
@@ -1337,6 +1340,36 @@ Known issues:
  - DSN unitext handling is not present
  - no provision for converting logging from or to UTF-8
 
+----
+IMAP folder names
+
+New expansion operator:
+
+${imapfolder {<string>} {<sep>} {<specials>}}
+
+The string is converted from the charset specified by the headers charset 
+command (in a filter file) or headers_charset global option, to the
+modified UTF-7 encoding specified by RFC 2060, with the following
+exception: All occurences of <sep> (which has to be a single character)
+are replaced with periods ("."), and all periods and slashes that aren't
+<sep> and are not in the <specials> string are BASE64 encoded.
+
+The third argument can be omitted, defaulting to an empty string.
+The second argument can be omitted, defaulting to "/".
+
+This is the encoding used by Courier for Maildir names on disk, and followed
+by many other IMAP servers.
+
+   Example 1: ${imapfolder {Foo/Bar}}       yields "Foo.Bar".
+   Example 2: ${imapfolder {Foo/Bar}{.}{/}} yields "Foo&AC8-Bar".
+   Example 3: ${imapfolder {Räksmörgås}}    yields "R&AOQ-ksm&APY-rg&AOU-s".
+
+Note that the source charset setting is vital, and also that characters
+must be representable in UTF-16.
+
+
+
+
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