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go-chasquid-smtp/test/t-12-minor_dialogs/bad_mail_from.cmy
Alberto Bertogli e7309a2c7b smtpsrv: Send enhanced status codes
SMTP supports enhanced status codes, which help with
internationalization and accessibility in cases where protocol errors
make their way to the users.

This patch makes chasquid include these extended status codes in the
corresponding replies, as well as advertising support in the EHLO reply.

Main references:
- RFC 3463 (https://tools.ietf.org/html/rfc3463)
- RFC 2034 (https://tools.ietf.org/html/rfc2034)
- SMTP Enhanced Status Codes Registry
  (https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml)
2019-01-10 15:44:25 +00:00

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c tcp_connect localhost:1025
c <~ 220
c -> HELO localhost
c <~ 250
c -> MAIL LALA: <>
c <- 500 5.5.2 Unknown command
c -> MAIL FROM:
c <~ 500
c -> MAIL FROM:<pepe>
c <~ 501
c -> MAIL FROM:<a@xn--->
c <- 501 5.1.8 Malformed sender domain (IDNA conversion failed)
c -> MAIL FROM:<aaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaX@bbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbX>
c <- 501 5.1.7 Sender address too long