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Spec documents:
RFC6530 Overview and Framework for Internationalized Email
RFC5890 Internationalized Domain Names for Applications (IDNA):
Definitions and Document Framework
RFC6533 Internationalized Delivery Status and Disposition Notifications
- rcpt verification for an internationalized message should require the
destination supports the SMTPUTF8 extension
- transport ditto; nonsupport equates to perm-rej an triggers a bounce
- DSN support extended per rfc 6533
======================
to-Alabel convert of helo name
- smtp transport
++ An "international" flag on the message?
++ An is-international expansion condition?
++ helo-time option handling
++ conversion of utf-8 domains for DNS rfc5890
-- MSA mode: convert on forward?
--- mua-wrapper
--- acl control?
++ flag in spool file
retries
- apply to a-label or utf8 form?
dsn handling rfc6533
- ORCPT param: utf8 vs. unitext encoded
-- to/from unitext expansions ( foo\x{HEXPOINT} - 2-6 hex digits )
logging
++ - international msg
- presentation of local-part in log
-- a log option?
encoding of local_part
++ Recieved-by header tracking info
++ - WITH protocol types get UTF8 prefix
++ - use for logging also
forwarding checks rfc6530 7.1 -3-
- rcpt-time rejects get 533 mailbox name not allowed
- mail-time rejects get 550 mailbox unavailable
- bounces (see dsn handling)
++ expansions for to- and from-Alabel ? bug1567
enhanced status codes? rfc5248++
VRFY
EXPN
non-smtp input
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