Email deliverability, on autopilot

Stop your SPF records from silently breaking your email.

Mailbox Radar monitors your SPF, DKIM, and DMARC, keeps you under the 10-lookup limit with automatic flattening, and alerts you the moment a sender change threatens your deliverability.

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Tracks the senders in your SPF record

Google WorkspaceMicrosoft 365SendGridMailchimpAmazon SESZendeskSalesforcePostmarkHubSpotMailgun Google WorkspaceMicrosoft 365SendGridMailchimpAmazon SESZendeskSalesforcePostmarkHubSpotMailgun

Everything you need to protect your sending domain

One dashboard for the records that decide whether your email lands in the inbox or disappears.

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Lookup limit guardrails

Live count of your SPF DNS lookups with a warning well before you hit the hard limit of 10 that triggers a permerror.

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Automatic flattening

Collapse dozens of provider includes into a maintained set of IP ranges — hosted and rotated for you, so the record never goes stale.

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Real-time alerts

Get notified when a provider changes its IPs, your record drifts, or a policy turns invalid — before mail starts bouncing.

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Sender change feed

See exactly what your email providers are doing to your SPF surface: ranges added, ranges removed, dated and attributed.

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SPF, DKIM & DMARC

Validate all three authentication records from one place and catch misconfigurations that quietly hurt your reputation.

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Guided fixes

Plain-language recommendations for every issue — remove dead includes, split subdomains, or flatten — ranked by impact.

Twenty senders, zero lookup errors

Adding a new ESP shouldn't mean rewriting your SPF by hand and hoping you stay under the limit. Mailbox Radar resolves every include down to the IPs it authorizes and republishes a flat, lookup-free record automatically.

Deep, changing includes become a few shallow ones you control
Re-resolved on a schedule and rotated when providers change IPs
Guardrails stop a bad resolution from ever breaking your mail

v=spf1
  include:_spf.google.com      (5 lookups)
  include:sendgrid.net         (3 lookups)
  include:mail.zendesk.com     (2 lookups)
  include:_spf.salesforce.com  (3 lookups)
  ... + 16 more                ✗ 23 / 10 — permerror

  ────────────  flattened  ────────────

v=spf1
  ip4:... ip4:... ip6:...
  include:_c1.spf.mr.yourdomain
  include:_c2.spf.mr.yourdomain
  ✓ 2 / 10 lookups · 340 IPs covered

● Alert · Jul 18, 09:42
  Google added 3 IPv4 ranges to _spf.google.com
  Flattened record updated automatically. No action needed.

● Warning · Jul 15, 14:10
  SendGrid removed a /24 — change held for 48h grace
  Review before it is dropped from your record.

● Info · Jul 12, 08:00
  DMARC policy still p=none. Consider p=quarantine.

Know before your customers do

Deliverability problems are invisible until replies stop coming. Mailbox Radar watches your authentication records around the clock and tells you what changed, why it matters, and what to do about it.

Email and webhook alerts for every meaningful change
Full audit log so any incident traces to a specific change
Drift detection if your published records are edited