404 Error on Ad-hoc Send Retry Resolved
Emily Lane
August 23, 2024
Customers experienced a 404 error when using the Send Again feature on undeliverable notifications for ad-hoc sends that included a fan-out (lists, tenants, array of profiles, audiences). The Send Again feature would work for the full original message but would fan out and re-send to all recipients. The endpoint was rewritten to address this problem and now successfully supports re-queuing ad-hoc list messages.
Learn more: Learn more about sending with tenants · See how to send to a list or list pattern
More updates
Redesigned Settings Page
Settings is redesigned, with workspace and developer pages in separate sections and nine background colors.
By Emily Lane
August 18, 2026
Redesigned Preferences Editor and hosted preference center
Build, preview, and launch a branded notification preference center with no frontend code.
By Emily Lane
July 18, 2026
Experiments: A/B Testing in Journeys
Run 2 to 10 message variants on a single send node in a journey, split live traffic by weight, compare per-variant results, and promote the one you want.
By Emily Lane
July 09, 2026
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