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Growth · September 2, 2025

Cllavio

Email marketing built for startups, with a real API

Cllavio launched on September 2, 2025 with 9 votes, #1,272 of 8,160 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 1 year on.

Visit sendtrim.com ↗Cllavio alternativestop 16% of September 2025

What it does

Email marketing built for builders. Fast APIs, clean UI, real-time analytics, and bounce safeguards. Free for 3 months: 350k emails/mo (UI), 500k (API), 50k contacts. Ship campaigns in minutes—without the legacy bloat.

Email marketing that actually lands: campaigns + SMTP API, deliverability guardrails (SPF/DKIM/DMARC), analytics, and transparent pricing. Start free.

Validate before you send, watch bounces in real time, and let guardrails protect your domain — no migration headache, no bloat. Simple, fast, predictable. You ship emails — not configuration. Syntax, MX, disposable, SMTP response — the same pipeline used before sending. Try a real mailbox first, then a fake one to see SMTP rejection. Real-time SMTP probing catches invalid, disposable, and risky addresses — so every send lands where it should. No credit card. No setup calls. Just sign up, import your list, and hitfrom sendtrim.com

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