"Can we reach the inbox?"
Deliverability Score
From delivery rate, recipient domain tier, sending-group performance, and bounce history.
Tower · all runways checked
Clear to send?
Real-time sender reputation and recipient intelligence for teams that can't afford a blocked campaign.
FLEET · 30 IPs · last 24h
scan 09:30 UTC
Excellent 12Good 10Warning 4Poor 3Critical 1
- 198.51.100.1194
- 198.51.100.1891
- 198.51.100.2588
- 198.51.100.3287
- 198.51.100.3986
- 198.51.100.4685
- 198.51.100.5384
- 198.51.100.6083
- 198.51.100.6782
- 198.51.100.7482
- 198.51.101.8181
- 198.51.101.8880
- 198.51.101.9579
- 198.51.101.10277
- 198.51.101.10976
- 198.51.101.11674
- 198.51.101.12372
- 198.51.101.13071
- 198.51.101.13769
- 198.51.101.14466
- 198.51.102.15164
- 198.51.102.15861
- 198.51.102.16558
- 198.51.102.17255
- 198.51.102.17947
- 198.51.102.18643
- 198.51.102.19338
- 198.51.102.20031
- 198.51.102.20722
- 198.51.102.21414
- weighted signals per IP
- 5
- weighted signals per IP
- scores per recipient
- 3
- scores per recipient
- Scans every 10 minutes
- 10 min
- Scans every 10 minutes
Trusted by email operations teams at
The problem
You're flying the campaign without instruments.
- 01
You find out an IP is burned after the campaign, not before.
- 02
Open and click rates are inflated by Apple Mail Privacy Protection and security scanners, so you can't tell who is really engaged.
- 03
Reputation and list quality live in two different tools, owned by two different people.
IP Monitoring
Air Traffic Control for your sending fleet
Every IP gets a 0–100 reputation score blended from five weighted factors.
35%
25%
15%
15%
10%
- 35% Bounce Rate
- 25% Complaint Rate
- 15% Engagement
- 15% Block Rate
- 10% Volume Stability
- Excellent ≥80
- Good ≥60
- Warning ≥40
- Poor ≥20
- Critical <20
- Fleet view with a 24-hour or 7-day window
- Per-IP detail with hourly trend and top recipient domains
- Cluster analysis that groups IPs with similar failure patterns so you fix the cause once, not twelve times
- Alerts when an IP crosses a status band
- AI-written fleet summaries and recommendations that explain what changed and what to do
198.51.102.44 · pool-marketing-03
64Good▼ 22 in 24h
−24h−12hnow
- Bounce Rate · 35%
- 72
- Complaint Rate · 25%
- 58
- Engagement · 15%
- 81
- Block Rate · 15%
- 44
- Volume Stability · 10%
- 90
TOP RECIPIENT DOMAINS
gmail.com 41%outlook.com 22%yahoo.com 14%icloud.com 9%
List Scoring
Know who you can reach, and who will respond
"Will they interact?"
Engagement Score
From real opens, real clicks, and recency.
The headline number
Blended Score
0.55 × Deliverability + 0.45 × Engagement
- Excellent
- Good
- Fair
- Poor
- Very Poor
- Recipient explorer with filters and export
- Audience Behavior Report by domain and tier
- List Builder: assemble a send list from score and tier criteria and export it
- Sending Groups view comparing infrastructure performance
- Machine-learning engagement model trained on your own data that predicts each recipient's real-open rate, with published performance stats (F1, AUC-ROC, feature importance) and a rules-vs-ML comparison so the model is never a black box
LIST · spring-promo-eu · 1,284,310 recipients
- 18%Excellent
- 31%Good
- 27%Fair
- 15%Poor
- 9%Very Poor
| Recipient | Deliv. | Engage | Blended | Tier |
|---|---|---|---|---|
| j.mar••@acme-corp.com | 92 | 78 | 86 | Excellent |
| priya.s••@gmail.com | 88 | 61 | 76 | Good |
| t.oko••@outlook.com | 74 | 52 | 64 | Good |
| r.bel••@yahoo.com | 63 | 31 | 49 | Fair |
| info@••-retail.de | 41 | 12 | 28 | Poor |
| k.wal••@aol.com | 22 | 4 | 14 | Very Poor |
How it works
From approach to clearance in four steps
Read-only access. Scoring runs on your own data, inside your environment.
STEP 1
Connect
Connect, read-only, to your sending platform's delivery data and recipient history.
STEP 2
Scan
C2S scans continuously and scores every IP and every recipient.
STEP 3
Brief
Alerts, clusters, and AI briefings tell you what changed and why.
STEP 4
Clear
Build and export the list you're clear to send to.
Deployment and security
Runs next to your data. Stays there.
C2S ships as compiled Docker images and runs on your own server or cloud account, in your VPC, next to your data.
- Your data never leaves your environment
- Read-only connections to source systems
- Role-based access (viewer, analyst, admin)
- Every API call authenticated
- Delivered through a private release channel with checksummed artifacts
- Optional AI features can be disabled
Web
API
Workers
Postgres (read-only)
OpenSearch (read-only)
Who it's for
Built for the people who own the send button
ESPs and sending platforms
Protect shared IP pools and show customers their health.
Agencies
Prove list quality before a send.
High-volume brands
Stop burning IPs on cold segments.
FAQ
Questions from the tower
Which sending platforms do you connect to?
C2S is adapter-based. It was built first for PureCast/PureDelivery-style stacks (Postgres + OpenSearch); additional sources connect via adapters.
Does any email content leave our network?
No.
How often does it scan?
IP reputation every 10 minutes; list scoring on demand or on a schedule.
Do we need a data science team for the ML model?
No — one click to train, and performance stats are shown.
Can we restrict who sees what?
Yes, via roles.
How is it delivered and updated?
Versioned releases, docker compose, upgrade in minutes.
Request a demo
Tell us about your sending program
We reply within one business day. No data access needed for a demo.