Compile with EXPERIMENTAL_INTERNATIONAL and libidn.
-Main config option smtputf8_advertise_hosts, default '*',
+New main config option smtputf8_advertise_hosts, default '*',
a host list. If this matches the sending host and
accept_8bitmime is true (the default) then the ESMTP option
SMTPUTF8 will be advertised.
the expansion variable $message_smtputf8 will have value TRUE.
The option allow_utf8_domains is set to true for this
-message, but all DNS lookups are converted to a-label form.
+message. All DNS lookups are converted to a-label form
+whatever the setting of allow_utf8_domains.
+
+Both localparts and domain are maintained as the original
+utf8 form internally; any matching or regex use will
+require appropriate care. Filenames created, eg. by
+the appendfile transport, will have utf8 name.
+
+Helo names sent by the smtp transport will have any utf8
+components expanded to a-label form.
Log lines and Received-by: header lines will aquire a "utf8"
-prefix on the 'with' element, eg. utf8esmtp.
+prefix on the protocol element, eg. utf8esmtp.
-Expansion operators:
+New expansion operators:
${utf8_domain_to_alabel:str}
${utf8_domain_from_alabel:str}
${utf8_localpart_to_alabel:str}
${utf8_localpart_from_alabel:str}
+Known issues:
+ - Currently LMTP is not supported.
+ - DSN unitext handling is not present
+ - no provision for converting logging from UTF-8
+ - VRFY and EXPN not handled
+ - MSA mode not handled (!)
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