SMTP

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SMTP reply codes

  • 5.5.0 unavailable (bob knows why)
  • 5.1.1 something wrong on exchange sewer, probably user unknown
  • 5.2.2 over quota


test smtp auth

echo -n "\0username\0password"| base64
openssl s_client -connect smtp.example.com:587 -starttls
HELO somehostname
AUTH PLAIN MzIwOTQyODUyMjYyNg==