The comparison · Mailstinger vs. Kaseya

Kaseya sells the lock-in. We sell the unsubscribe.

Kaseya's business model is bundling — 20 products in one contract so leaving costs more than staying. That's fine if you've been on IT Complete for five years and DMARC is just another checkbox. It's the wrong shape when DMARC is the actual problem you need solved.

Kaseya pricing
IT-Complete bundle pricing is quote-only, MSP-scaled, typically 3-year commit. DMARC / email security is a line item inside the bundle — no standalone per-domain number.
See their pricing page →
Mailstinger pricing
Standalone tool, flat pricing, month-to-month. Cancel inside the settings page, not by calling an account manager.
If you're already a Kaseya shop, we bolt on for the cost of a single client seat. If you're shopping outside Kaseya, our Agency tier replaces the 'Email Security' line at ~10% of bundle cost.
Credit where it's due

Here's what Kaseya genuinely does well.

No false dichotomy. If these are deal-breakers for your context, they might be the right choice. We'd rather you buy the right tool than hate us in six months.

  • Genuine scale on the MSP-platform side — RMM (VSA), documentation (IT Glue), backup (Datto), and ticketing in one admin. If you run 50 SMB clients and need one console for everything, that's a real argument.
  • Graphus AI anti-phishing (Kaseya-owned) is a decent inbound detection layer — complementary to DMARC, not a replacement.
  • Channel support and partner programs are mature; you can build a whole MSP P&L on their stack if you choose to.
§02 · Where we diverge

Capability by capability. Everything listed here is verifiable.

No hand-waving. If we claim a feature, it's shipped and you can test it free on the analyzer. If we claim a competitor doesn't have something, it's because their docs / pricing page / product tour say they don't.

Contract shape
Mailstinger
Month-to-month. Self-service cancel. No minimum term.
Kaseya
Typically 3-year IT-Complete commitments; extensively documented auto-renewal friction in customer reviews.
DMARC as a first-class product
Mailstinger
The whole company is this. Every weekly release touches the DMARC / SPF / DKIM / MTA-STS / BEC pipeline.
Kaseya
DMARC is a feature-within-a-feature inside email security, inside IT Complete. Roadmap attention is proportional.
Paste-ready DNS fixes + hosted SPF / managed DMARC
Mailstinger
Core workflow — hosted SPF with 22-ESP catalog, auto-flatten, one-click authorise from a report row, CNAME delegation on Agency.
Kaseya
Not a native capability at the IT Complete email-security layer. You'd use a partner integration or do DNS edits by hand.
Buyer experience
Mailstinger
Scan a domain, read the verdict, sign up. 4 minutes total.
Kaseya
Sales call, scoping, PSA integration discussion, multi-year quote, onboarding meeting, training.
If you're already on Kaseya
Mailstinger
We run alongside VSA / IT Glue — webhooks + API let you wire findings into your existing PSA tickets.
Kaseya
Everything's in one admin. Good if you want one login; bad if that login controls your renewal leverage.
The honest verdict

Kaseya's pitch is 'one vendor for everything.' Its weakness is the same sentence. When DMARC is the thing you need, 'email security, inside IT Complete, inside Kaseya' is three layers of abstraction away from the record you need to publish. We cost less, ship in an afternoon, and integrate into your existing PSA without rewriting your contract.

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