100% open-source email infrastructure

Email Performance Monitoring Service

Real-time email performance monitoring and detailed analytics to track delivery times, server performance, bounce rates, and user engagement metrics efficiently

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Live delivery data

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.

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Current Delivery Times

We tested delivery ourselves: these figures are data from our own monitor, which sends test messages about every 5 minutes. Direct is a message from our servers to an inbox at that provider. Forwarding is a message to a Forward Email address that forwards it to that inbox. According to our latest test, every message arrived within 6.2s.

  • Forward Email

    Direct
    3.9s
    Forwarding
    2s
  • Gmail

    Direct
    3.2s
    Forwarding
    3.2s
  • Apple iCloud

    Direct
    3.9s
    Forwarding
    6.2s
  • Yahoo/AOL

    Direct
    2.5s
    Forwarding
    2.6s