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Testing Your SMTP Integration

Verify your SMTP configuration is working correctly before going to production.

Quick Connection Test​

Test basic SMTP connectivity:

telnet mail.motorical.com 2587

Expected response: 220 mail.motorical.com ESMTP Postfix

TLS Connection Test​

Verify TLS/STARTTLS is working:

openssl s_client -connect mail.motorical.com:587 -starttls smtp -crlf

Check TLS certificate details:

echo | openssl s_client -connect mail.motorical.com:587 \
  -starttls smtp 2>/dev/null | openssl x509 -noout -dates -subject

Send a Test Email with swaks​

swaks is the go-to tool for SMTP testing:

# Install: apt-get install swaks (Ubuntu) or brew install swaks (macOS)

swaks \
  --to [email protected] \
  --from [email protected] \
  --server mail.motorical.com \
  --port 2587 \
  --auth-user "your_motor_block_username" \
  --auth-password "your_motor_block_password" \
  --tls-optional \
  --header "Subject: SMTP Integration Test" \
  --body "If you receive this, your SMTP integration is working!"

Test Checklist​

TestWhat to Verify
✅ Basic ConnectivityServer responds on mail.motorical.com:2587
✅ AuthenticationMotor block credentials are accepted
✅ TLS/STARTTLSSecure connection is established (TLS 1.2+)
✅ Email DeliveryTest email reaches destination inbox
✅ DNS RecordsSPF, DKIM, DMARC are correctly configured

Verify via the API​

After sending a test email, confirm delivery via the Motorical API:

curl -H "Authorization: Bearer $TOKEN" \
  "https://api.motorical.com/api/public/v1/motor-blocks/$BLOCK_ID/logs?limit=5"

Common Test Failures​

Connection Refused​

  • Check firewall allows outbound on port 2587
  • Try port 587 as alternative
  • Verify DNS resolution: nslookup mail.motorical.com

Authentication Failed​

  • Double-check username and password (not your Motorical login)
  • Ensure the Motor Block status is "active"
  • Regenerate password in the Motor Blocks dashboard if needed

TLS Handshake Failed​

  • Ensure your client supports TLS 1.2+
  • Update your system's CA certificate bundle
  • Check system clock accuracy (must be within ±5 minutes)