Dev Tools · 1h ago
DIY A/B test email subject lines with an agent, no ESP needed
Nylas CLI enables A/B testing email subject lines using an agent mailbox, bypassing traditional ESPs. The agent sends two variants, tracks replies via webhooks, and tallies results. This approach gives developers full control over the experiment logic and optimizes for reply rate, not opens.
Meridian48 take
A clever hack for developers who already own their email pipeline, but the DIY nature means it's only worth the effort if you're already deep in Nylas's ecosystem.
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A/B test email subject lines with an agent — no ESP required →
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