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SMTP

Troubleshooting

TLS

  1. Prepare encoded strings for your mail username and password
echo -ne "mail@example.net" | base64
  1. Connect to mail server
openssl s_client -starttls smtp -connect smtp.example.com:587
  1. Send HELO
EHLO
  1. Authenticate
AUTH LOGIN
<your-encoded-username>
<your-encoded-password>

If that's successful the mail server should return 235 2.7.0 Authentication successful.