Aerosend Isolation Ratio
Aerosend's core value for agencies hinges on the isolation ratio: every 10 client domains get their own dedicated server and IPs. This prevents one client's poor sender reputation from dragging down others, a common failure in shared infrastructure. For an agency managing 50 cold outreach domains, this means 5 isolated server clusters. The burn alert system, monitoring five metrics (warmup reputation, inbox placement, reply rate, bounce rate, bounce type), triggers before reply rates collapse, giving you time to rotate IPs or pause campaigns. With per-inbox pricing at $4/month for the first 150, a 10-domain client setup costs $40/month in infrastructure, but you can package this as a $299/month managed deliverability retainer, yielding healthy margins. The white-label plan allows full rebranding, so you can resell Aerosend's infrastructure as your own, with sub-4-hour Slack support for your team. This framework helps you decide how many domains to allocate per server based on client risk tolerance and retainer size.
By InnovaAI ResearchPublished Updated
What is Aerosend Isolation Ratio?
“10 domains per server → burn alert before reply rate drops”
Aerosend's core value for agencies hinges on the isolation ratio: every 10 client domains get their own dedicated server and IPs. This prevents one client's poor sender reputation from dragging down others, a common failure in shared infrastructure. For an agency managing 50 cold outreach domains, this means 5 isolated server clusters. The burn alert system, monitoring five metrics (warmup reputation, inbox placement, reply rate, bounce rate, bounce type), triggers before reply rates collapse, giving you time to rotate IPs or pause campaigns. With per-inbox pricing at $4/month for the first 150, a 10-domain client setup costs $40/month in infrastructure, but you can package this as a $299/month managed deliverability retainer, yielding healthy margins. The white-label plan allows full rebranding, so you can resell Aerosend's infrastructure as your own, with sub-4-hour Slack support for your team. This framework helps you decide how many domains to allocate per server based on client risk tolerance and retainer size.
More on Aerosend
- StrategyWhy Aerosend Compounds for Agency LTV
- Evaluation RuleWhen to Adopt Aerosend: If You Manage 10+ Client Domains and Need Isolation
- Decision FrameworkAerosend: Buy vs Skip (Cold Email Agency Scale)
- Failure PatternWhy Agencies Fail With Aerosend in Cold Outreach: The Domain Isolation Trap
- Implementation BlueprintAerosend Managed Deliverability Retainer (5-7 days)
- Operating ProcedureAerosend Domain Isolation Setup (Onboarding)