SMTP Monitor

The SMTP Monitor verifies that your SMTP server is reachable and responsive. This helps you detect outages of outbound mail gateways and mail delivery infrastructure before users report missing emails.

How it works

• We connect to your SMTP server and validate that it responds as expected.
• If the server cannot be reached or does not respond in time, we mark the check as failed.

Configuration

Basic settings

• Hostname: Hostname only, without protocol or path.
• Port: Optional. Use your SMTP port (commonly 25 / 587 / 465).
• Check interval and Timeout.
• Status: active, maintenance, disabled.

Advanced settings

Depending on your use case, advanced options (e.g. encryption/auth requirements) can be configured via the monitor settings.

Monitoring locations

SMTP checks run from our monitoring locations. You can restrict execution using Allowed Check Countries (monitor-level) or by using the customer-level defaults.