# SaaStr says AI-led email tests prompted a newsletter vendor switch

_Published Thursday, November 5, 2026 at 11:13 AM EST · AI, Products · Latest · Tier 2 — Notable_

SaaStr says it began moving core newsletter sends to a different vendor after its AI marketing agent compared three providers across more than 500,000 emails this week. The agent found that the incumbent marked a send completed despite records showing 80,708 attempts and 80,708 errors, with no emails sent.

A matched campaign test also favored a challenger, although SaaStr cautioned that opens were noisy and raw clicks included security scanners. The company chose a gradual migration rather than moving all 80,000+ subscribers immediately, with increases conditional on bounce, complaint and unsubscribe results.

## Sources

- [SaaStr](https://www.saastr.com/we-ran-an-email-deliverability-bake-off-across-3-vendors-and-500000-emails-this-week-our-ai-agent-ran-all-of-it/)

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Canonical: https://techandbusiness.org/newswire/dYDGilGYNgsXmu_n3DN4ZL
Published: 2026-11-05T16:13:38.597Z
Story chronology: 2026-11-05T15:00:24.000Z
Retrieved: 2026-11-06T22:49:56.735Z
Publisher: Tech & Business (techandbusiness.org)