100% open-source email infrastructure

Email Capacity Planning Service

Email infrastructure capacity planning and scaling service designed to optimize email server resources and efficiently handle growing email volumes for.

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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 10/7/26 1:17 PM UTC

Current Delivery Times

  • Forward Email

    Direct
    391ms
    Forwarding
    396ms
  • Gmail

    Direct
    951ms
    Forwarding
    987ms
  • Apple iCloud

    Direct
    3.5s
    Forwarding
    4.3s
  • Yahoo/AOL

    Direct
    1.6s
    Forwarding
    1.7s