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Upcoming change to webhooks: no more open events after 45 days

One of the defining features of Postmark that we know customers love is our 45-day content history. As most of you know, Postmark includes a searchable activity feed that includes any emails sent in the previous 45 days. You can filter by delivery events, tags, or date and view the message or the activity history for all messages sent to a specific email address.

After 45 days, original email content and metadata are removed from our system. But there’s been one area that’s always been a little weird. We keep tracking email open events — and fire webhooks for those events — for, well, basically forever. The problem is that you won’t be able to do much with this information, since the content and metadata aren’t available after 45 days.

So we’re going to change that. Starting August 1st, 2018, open events will work just like click events and delivery events. To put it another way, we’ll stop firing webhooks for all events after 45 days of an email being sent.

We haven’t been able to find a use case where customers need open events for longer than the content is available. That said, if not getting open event webhooks starting 45 days after an email was sent would affect your workflow in any way, we’d love to hear about it. Please send us an email to and let us know.

Rian van der Merwe

Rian van der Merwe

Product person. Lover of family, coffee, and vinyl records.