Frequently asked questions

No. SPF, DKIM, DMARC verify that a sender has the right to send — not that they have something legitimate to say. Spammers buy domains and configure SPF perfectly. FrozenSpam combines both: authentication first, challenge second.

Once. On their first email. And only if they aren't already in your contacts or if you haven't written to them. Over 12 years of production, the rate of unchallenged real humans is under 1%.

You can whitelist an entire domain in one line (`@newsletter.lemonde.fr`). And our noreply filter automatically detects `noreply@`, `bounce@`, `no-reply@` etc. and doesn't challenge them.

Gmail sorts identifiable spam into a folder. FrozenSpam prevents spam from arriving. And critically, FrozenSpam works for your professional domain at OVH, Gandi, M365, SmarterMail, Exchange — where Gmail cannot help you.

MailInBlack is a good product. But their pricing is opaque (quote required), they don't have auto-whitelist outbound, and their commitment is annual. FrozenSpam will cost you less, let you test a month with no commitment, and guarantees nobody you've written to will be quarantined.

Two MX in parallel (mx1 + mx2, distinct IPs). If one falls, the other takes over. If both fall, your MTA retries for 24 h per RFC 5321 — no mail is lost.

Before any challenge, FrozenSpam checks the sender's domain SPF + DMARC. If authentication fails, the mail is dropped silently, no challenge sent to a spoofed address.

mail-tester.com score 10/10 validated 2026-05-23: SPF/DKIM/DMARC/PTR/SpamAssassin/blacklists all OK.

Yes. FrozenSpam is an MX gateway placed in front of your existing mail server. You keep Exchange, SmarterMail, OVH, Gandi, M365 — we filter just before mail arrives at your server.

Yes — REST JSON, OAuth2, OpenAPI 3.1. Endpoints available for quarantine, whitelist, stats, journal.

Excl. VAT. French 20% VAT applies for individuals and non-VAT-registered French companies. European companies outside France: no VAT (reverse charge).

Button in your dashboard, two clicks. Immediate effect. No notice. Data purged 30 days later.

You pay €1 symbolic at startup. For 15 days after, you can request a full refund. From D+30 onward, normal plan rate. Cancelable anytime, no notice.

No automatic block. We write to propose the next plan. If you decline, we stay at the current plan price through end of month.

The content of your emails is never analyzed by default. The decision is made on headers, SPF/DMARC result, and your contact lists.

Bare metal OVH, France (Roubaix). No mail leaves French territory. No third parties (OpenAI, Google, Anthropic) involved.

Yes, via the contact form — standard FrozenSpam DPA, or custom DPA for Volume plans.

Yes. Full JSON export anytime from the dashboard. Data purged 30 days after cancellation.

€1 symbolic at startup. 15-day full refund window. From D+30 onward, normal plan rate (€4.90 Solo, €3.90 Team, €2.90 SMB).

If you don't ask for a refund within 15 days, you continue at the normal plan rate. Still cancelable anytime in two clicks from the dashboard.

Yes, no notice. You repoint your old MX (5 minutes) and it's over.

Five minutes on the DNS side (MX change). We write you the procedure within 24 h of registration.