Alberto Bertogli 7cbe6a5076 courier: Support SMTPUTF8 in the SMTP courier ...

This patch adds SMTPUTF8 to the SMTP courier.

It introduces a new internal/smtp package that extends Go's net/smtp with
SMTPUTF8 (in a very narrow way, not for general use), and then makes the
courier use it.

Also use an IDNA-safe version when saying hello, otherwise servers could
complain if the hostname is not ASCII, and at that stage we don't know if they
support it or not.

2016-10-10 00:51:04 +01:00

4.1 KiB

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