Pillar 01 · Health monitoring

See the decay before the crater.

Continuous placement testing, blacklist probes across 11 DNSBLs, warmup vitals every four hours. Risk scores rise before deliverability collapses — so you act on the warning, not the wreckage.

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The painful status quo

Domains die two weeks before you notice.

By the time bounce rates climb and meeting bookings stall, the placement collapse is already weeks old. Cold-email infrastructure tells the truth backwards — in casualties, not in warnings.

  • Spam-folder placement degrades silently for ten to fourteen days before campaign metrics react.

  • Blacklist hits often go undetected until a major client flags undelivered mail.

  • Warmup vitals are evaluated weekly, if at all — far slower than the half-life of a problem domain.

What Mailnurse does

Continuous vitals on every sending account.

  1. 01

    Probe.

    Mailnurse pings eleven DNSBLs nightly, tests inbox placement across the major providers, and re-evaluates authentication every four hours.

  2. 02

    Score.

    A composite risk score per account combines placement, warmup curves, bounce velocity, and reputation signals. Trends, not snapshots.

  3. 03

    Surface.

    When risk crosses your threshold — alert. When risk crosses Mailnurse's — automatic action. You see the warning before deliverability collapses.

Built into monitoring

The instrument panel for cold-email infrastructure.

11-DNSBL probes.

Spamhaus, SORBS, Barracuda, SpamCop, and seven more — all checked on a nightly cycle. Every flag is timestamped so first-detection times are tracked.

Inbox placement testing.

Synthetic recipient pool across Gmail, Outlook, Workspace, and the major B2B ESPs. Real placement, not heuristics.

Warmup vitals.

Open-rate, reply-rate, and engagement trajectories sampled every four hours. The slope tells you more than the level.

Composite risk score.

One number per account that fuses placement, blacklists, authentication, bounces, and tenure. Sortable across your whole fleet.

Monitoring FAQ

What Mailnurse watches, how often, and why.

Which DNSBLs does Mailnurse probe?
Eleven, refreshed nightly: Spamhaus ZEN, SORBS DUHL, Barracuda Reputation Block List, SpamCop, UCEPROTECT levels 1 and 2, Composite Blocking List, Invaluement IVMURI, Mailspike Z, Hostkarma Black, and PSBL. Each result is timestamped; first-detection times are tracked so listings are caught before they propagate.
How is inbox placement actually tested?
Mailnurse maintains a synthetic recipient pool across Gmail consumer, Workspace, Outlook consumer, Microsoft 365, and the major B2B providers. Test sends dispatch on a continuous cycle; each lands in inbox, promotions, or spam. The pool rotates and refreshes so no recipient seed becomes stale.
Why every four hours instead of every minute?
Warmup vitals are slope features, not point features. A four-hour window is long enough to filter sub-hour noise (server-side bounce backlogs, recipient-pool latency) and short enough to catch genuine decay before the day ends. Faster cycles tested worse — signal-to-noise collapsed.
What's in the composite risk score?
Placement percentile (40%), blacklist flags weighted by severity (25%), authentication pass-rate over the last 24 h (15%), bounce velocity vs. seven-day baseline (10%), and account tenure (10%). Weights are tunable per workspace; defaults track to what worked at the Lanello agency.
Pairs well with

Two disciplines that compound this one.

03

Auto-pause spam

When bounce velocity climbs, DNSBLs hit, or placement drops, the rules engine pauses sends before the campaign goes wider. Eight codified rules with severity tiers.

Read more 02

Auto-rotate domains

When a domain burns, replace it end-to-end: Spaceship → Cloudflare → Workspace → Instantly → warmup. The ten-hour playbook, run while you sleep.

Read more

Care, expressed as precision.

Cold-email infrastructure that watches itself — so you can focus on the campaign, not the chassis.

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