---
title: "Time to Inbox monitoring page launched"
description: "Discover how fast transactional emails really reach the inbox. From API call to inbox delivery. Real-time insights into Lettermint's Time to Inbox."
url: "https://lettermint.co/changelog/time-to-inbox-monitoring-page-launched"
published: "2025-08-22"
last_updated: "2025-08-22"
---

# Time to Inbox monitoring page launched

> Discover how fast transactional emails really reach the inbox. From API call to inbox delivery. Real-time insights into Lettermint's Time to Inbox.

At Lettermint we promise fast delivery of [transactional emails](https://lettermint.co/features/transactional-emails),
but how fast is fast? With our new Time to Inbox (TTI) page you get
real-time insights into delivery speed.

The Time to Inbox (TTI) shows the current speed
of our transactional email infrastructure. We measure the time from
sending an email via our [API](https://docs.lettermint.co/) to
delivery in the inbox. We perform these measurements at the largest
email providers like Gmail, Outlook, Yahoo and more.

We've been using this data internally to monitor our infrastructure and ensure
speed. We're so proud of the results that we've decided
to make this data public.

For more explanation about Time to Inbox and how we measure it, check out our [Time
to Inbox page](https://lettermint.co/time-to-inbox-tti). Here you'll also read why we
separate transactional emails from [broadcast emails](https://lettermint.co/features/broadcast-emails)
like newsletters and campaigns.

![Time to Inbox overview](https://lettermint.co/content/changelog/lettermint-time-to-inbox.webp)
