Negligible — reads from mailq and log parsing.

Yes, multi-instance setups are supported.

Mail

Postfix Monitoring

Monitor Postfix mail queue sizes, delivery rates, bounce tracking, and connection metrics in real time with zero configuration.

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Why monitor Postfix?

Postfix is the most widely deployed mail transfer agent. Monitoring Postfix is essential to track mail queue health, delivery success rates, bounce rates, and detect delivery issues before they impact communication.

Auto-discovery via Xitogent

Mail queue size monitoring (active, deferred, hold)

Delivery rate and bounce tracking

Connection and rejection metrics

SMTP error rate monitoring

TLS connection tracking

Multi-instance support

1-minute collection intervals

Metrics

What we monitor

Queue Size

Messages in active, deferred, and hold queues.

Delivery Rate

Messages successfully delivered per minute.

Bounce Rate

Hard and soft bounce counts.

Rejection Rate

Rejected incoming connections.

SMTP Connections

Active SMTP connections.

TLS Connections

Percentage of TLS-encrypted deliveries.

Triggers & Alerts

Configurable alert triggers

Set up custom triggers in your dashboard to get notified the moment Postfix metrics cross your defined thresholds.

Postfix monitoring trigger configuration dashboard

Queue Size

critical

Fires when mail queue grows beyond threshold.

Bounce Rate

warning

Alerts on high bounce rates.

Delivery Failures

critical

Triggers on delivery failure spikes.

Rejection Rate

warning

Fires on high connection rejection rate.

Importance of Postfix Monitoring

Postfix handles critical email delivery. Queue buildup, bounces, and delivery failures can mean lost communications and damaged sender reputation.

Detect queue buildup before delivery is impacted
Track bounce rates to maintain sender reputation
Monitor delivery success rates
Identify connection issues early

Why Choose Xitoring

Zero-config mail server monitoring with comprehensive queue and delivery metrics.

One-command install
15+ global nodes
Unified dashboard
Multi-channel alerts
Historical retention

Before you start

Prerequisites for Postfix

Make sure you've got these in place — most installs are a 60-second job once they are.

Postfix MTA installed and running
Read access to /var/log/mail.log (or your configured maillog)
postqueue binary on the system PATH

Setup Guide

Get started in minutes

Install Xitogent on your mail server

Install the lightweight Xitogent monitoring agent on the host running Postfix.

curl -s https://xitoring.com/install.sh | sudo bash -s -- --key=YOUR_API_KEY

Confirm log and queue access

Postfix tracks mail flow through its mail log (`/var/log/mail.log` on Debian/Ubuntu, `/var/log/maillog` on RHEL). Make sure the log is being written and that `postqueue` is on PATH for queue inspection.

sudo xitogent integrate

Enable the Postfix integration

Use the Xitoring dashboard or CLI to enable the Postfix integration. Xitogent auto-detects your Postfix configuration and starts parsing queue and delivery metrics.

Configure alert thresholds (optional)

Set custom thresholds for Queue Size, Bounce Rate, or Delivery Failures to catch backpressure and reputation problems before they hit downstream senders.

Verify it's working

Run this command on the server to confirm Xitogent picked up the integration. Fresh metrics will start streaming to your dashboard within ~30 seconds.

sudo xitogent status

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Considering alternatives?

See how Xitoring stacks up against the alternatives for Postfix monitoring — flat pricing, deeper integrations, and one agent that covers your whole stack.