100% open-source email infrastructure

Email Analytics API

Track detailed email metrics through a powerful API. Monitor opens, clicks, bounces, and delivery status for every email to optimize your campaigns effectively

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Time to Inbox

Time to Inbox

We measure these delivery times with our own open-source monitor. It sends test emails to inboxes at major email providers and records how long each one takes to arrive. Our engineers get an alert when a delivery takes longer than 10 seconds. Source code is available on GitHub.

Last updated on 10/5/26 10:47 PM UTC

Current Delivery Times

  • Forward Email

    Direct
    748ms
    Forwarding
    390ms
  • Gmail

    Direct
    978ms
    Forwarding
    1s
  • Apple iCloud

    Direct
    2s
    Forwarding
    3.9s
  • Yahoo/AOL

    Direct
    1.5s
    Forwarding
    1.6s