Each case documents a specific infrastructure problem, the architecture deployed, and the verified outcome. Countries covered: 14. Industries: 8. Client identities withheld by request.
ESP Migration to Dedicated PowerMTA Infrastructure
3.8M subscriber retailer migrated from shared infrastructure. Inbox placement recovered, cost reduced 62%.
Transactional Email That Survives Marketing Events
400K-user SaaS with 2FA codes averaging 13 min during campaigns. Isolation reduced delivery to 38 seconds.
Cold Email Infrastructure Isolation and Reputation Recovery
14-client agency with cold outreach contaminating warm marketing. Per-client isolation prevents cross-account events.
Deliverability Recovery After Shared IP Blacklisting
FCA-regulated platform with complete delivery failure. Compliance email restored in 5 days; DMARC p=reject in 12.
IP Warming at Scale: 16 IPs, 6 Domains, 4 European ISPs
6-brand group, 16 new IPs warmed simultaneously across GMX, T-Online, Orange, Gmail. Zero blacklisting events.
Consolidating 4 SMTP Providers Into One Dedicated Environment
Stockholm SaaS running 4 overlapping SMTP providers consolidated onto single dedicated infrastructure with unified visibility.
Structured IP Warming Before Peak Season
8-week engagement-led warming protocol completed 5 days before Black Friday. 4.2M messages sent with 96% Gmail inbox rate.
DMARC p=reject Across 6 Domains, 14 Sending Systems
Compliance directive required p=reject. Audit discovered 14 sending systems across 6 domains. Zero legitimate emails blocked.
Separating Cold Outreach From Marketing Infrastructure
Cold B2B outreach collapsed Gmail reputation from HIGH to LOW. Complete infrastructure separation recovered warm marketing to 91%.
Transactional Email SLA Recovery for Policy Notifications
Regulatory SLA failures on policy notifications. Dedicated transactional infrastructure reduced average delivery from 4.2 min to 28 seconds.
FBL Integration and Complaint Rate Recovery
Reactivation campaign caused 1.8% complaint rate and Gmail LOW reputation. FBL integration and list surgery recovered inbox to 86%.
Email Infrastructure for 7 European Language Editions
7-edition publisher with German inbox at 58% due to ISP mismatch. Per-country IP routing lifted German inbox to 91%.
22-Client Cold Email Portfolio With Per-Client IP Isolation
22-client agency on shared tool experiencing cross-client IP contamination. Per-client IP allocation eliminated all cross-client events.
Migrating 8.4M Subscribers to Dedicated Infrastructure
8.4M subscriber SaaS platform on shared ESP. 16-week migration to 18-IP dedicated infrastructure. 71% cost reduction.
5 Brands, One Infrastructure, Complete Isolation
5 brands on 5 different ESPs consolidated onto single dedicated cluster with per-brand IP isolation. 48% cost reduction.
18-Month Deliverability Decline Reversed
18-month decline from 91% to 38% Gmail inbox. List surgery + dedicated infrastructure restored to 93% in 9 weeks.
Deliverability Across Japanese ISPs and Mobile Carriers
Tokyo e-commerce with 34% of customers on carrier email domains. ISP registration and per-carrier configuration lifted carrier inbox to 87%.
Sub-30-Second Transactional Delivery for Payment Notifications
Payment processor with 2FA timeout rate of 3.8%. Dedicated priority-queue infrastructure reduced timeouts to 0.2%, delivery to 22s.
The problems documented here — shared IP contamination, transactional disruption, cold email reputation bleed, blacklist events, ISP-specific failures — are the patterns we resolve regularly. Contact us for an assessment of your specific infrastructure.
HIPAA-compliant dedicated infrastructure achieving 99.4% inbox placement for patient notifications.
Read case study4M daily booking confirmations delivered in under 23 seconds with 98% inbox placement.
Read case studyMulti-domain architecture solving corporate, university, and consumer inbox placement simultaneously.
Read case studyStream separation reducing dispute costs from €180K to €31K per month.
Read case studyFundraising email program rebuilt from 40% spam rate to 97% inbox placement.
Read case study99.6% delivery to corporate legal inboxes via Proofpoint and Mimecast trusted sender registration.
Read case studyAccount compromise events reduced 44% through priority-tiered 2FA email infrastructure.
Read case studyProperty alert click rates tripled through engagement segmentation and dedicated IPs.
Read case study800K daily shipment notifications delivered in under 10 seconds across 28 European countries.
Read case studyGmail domain reputation recovered from BAD to HIGH in 11 weeks after aggressive list purge.
Read case study