Free Infrastructure Uptime Monitor

Monitor SMTP servers, DNS availability, SSL certificates, and HTTP endpoints in real-time.

Infrastructure Uptime Monitor

Monitor SMTP servers, DNS availability, HTTP endpoints, and SSL certificates

SMTP server hostname

Default: 25

What is Uptime Monitoring?

Infrastructure uptime monitoring helps ensure your email sending infrastructure is available and performing well. Regular checks can detect issues before they impact your email deliverability.

SMTP Check

Verifies your mail server is accepting connections and responding correctly.

DNS Check

Tests DNS server availability and resolution speed for your domain.

HTTP/HTTPS Check

Monitors web server availability for tracking links and landing pages.

SSL Check

Validates SSL certificates and warns of upcoming expiration dates.

Why Monitor Email Infrastructure Uptime?

Overview

Email deliverability depends heavily on infrastructure reliability. Monitoring your SMTP servers, DNS resolution, and SSL certificates ensures emails reach recipients without delays or failures. Our free uptime monitor checks your mail servers in real-time, detecting issues before they impact your campaigns.

SMTP Server Monitoring

Track your mail server availability and response times. Our SMTP monitor connects to your server on ports 25, 587, or 465, verifies the banner response, and measures latency. Detect server downtime, timeout issues, or misconfigurations instantly.

DNS Availability Checks

Ensure your DNS servers respond quickly to queries. Slow or unavailable DNS can delay email delivery and cause timeouts. Monitor DNS resolution speed to maintain optimal performance for SPF, DKIM, and DMARC lookups.

SSL Certificate Validation

Prevent security warnings and connection failures with SSL certificate monitoring. We check certificate validity, expiration dates, and warn you 30 days before expiry. Detect self-signed certificates and encryption issues that could block email delivery.

Best Practices

  • Monitor SMTP servers on all ports (25, 587, 465)
  • Check DNS resolution speed regularly
  • Track SSL certificate expiration (30-day warnings)
  • Monitor HTTP endpoints for broken links
  • Set up automated checks every 5 minutes
  • Configure email alerts for downtime