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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
++ An "international" flag on the message?
++ An is-international expansion condition?
++ helo-time option handling
conversion of utf-8 domains on input rfc5890
- deconversion on forwarding
- deconversion for trace headers
dsn handling rfc6533
logging
- international msg
- presentation of local-part in log
-- a log option?
encoding of local_part
encoding transform string-expansions
Recieved-by header tracking info
- WITH protocol types get UTF8 prefix
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
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