Stop damaging client domains. Learn how to build scalable, isolated cold email infrastructure to manage multiple clients and deliver predictable results.
Agency infrastructure often co-mingles clients, meaning one client's spam complaint can damage deliverability for your entire portfolio.
True multi-client infrastructure requires isolated domains, inboxes, and tracking for each client to prevent cross-contamination.
Using a client's primary domain for cold outreach is the fastest way to get it blacklisted. Always use dedicated, warmed-up domains.
Scaling an agency's cold email service means productizing infrastructure, not just campaign strategy. Your tech stack is your moat.
Running outbound campaigns for multiple clients is an operational minefield. Agencies often rely on fragile, co-mingled infrastructure where one client's aggressive campaign can damage the domain reputation of another. Without a clean separation between infrastructure and campaign logic, you can't scale, report accurately, or protect your clients' most valuable assets.
When you're managing multiple clients, generic sending tools create predictable failure points. The pressure to deliver results quickly clashes with the reality of deliverability.
Running Outbound on Fragile Infrastructure
Using a single account or a patchwork of tools for all clients is a ticking time bomb. One client gets flagged for aggressive sending, and suddenly deliverability tanks for everyone. You spend your days firefighting instead of executing campaigns.
Damaging Client Domains
A new client wants results yesterday. Your team ramps up volume on their domain without proper warmup, landing it on a blocklist. Now you've not only failed to deliver leads, but you've actively damaged their brand's primary asset—a cardinal sin for any agency.
No Clean Separation Between Clients
Mixing campaigns, lead lists, and sending logic in one place is chaos. Reporting becomes a nightmare of manual data pulls. You can't tell which client's campaign is performing, which domains are healthy, or where the bottlenecks are. You can't scale what you can't measure.
A scalable agency treats outbound as an infrastructure problem first and a creative problem second. The ideal state isn't about finding a magic script; it's about building a predictable, resilient sending machine.
Transitioning to an infrastructure-first model requires a systematic approach. It's not about tools; it's about process.
Step 1: Scope Infrastructure Per Client
Before sending, determine the required assets. A client sending 10k emails/month needs at least 2-3 dedicated sending domains and 5-10 inboxes to distribute the load safely. This is a non-negotiable part of the engagement.
Step 2: Isolate and Configure DNS
Purchase new domains (get[clientdomain].com, [clientdomain]hq.com). Never use the client's primary domain. For each domain, correctly configure SPF, DKIM, and DMARC records to authenticate your sending.
Step 3: Implement Mandatory Warmup
All new inboxes for every client must go through an automated warmup process for at least 2-3 weeks before being used in live campaigns. This builds reputation with inbox providers and is the single most important step for long-term deliverability.
Step 4: Orchestrate Campaigns with Rotation
Structure sequences to automatically rotate through the warmed-up inboxes and domains assigned to that client. This keeps daily volume per inbox low (30-50 emails) and protects the reputation of the entire asset pool.
Manually managing dozens of domains and hundreds of inboxes across multiple clients is impossible. This is where an infrastructure layer becomes critical. The right platform provides:
SuperSend is designed as this execution and infrastructure layer for outbound teams sending at volume. It provides the controls to manage multi-client operations safely. The next step isn't just trying a tool, but understanding the core infrastructure strategies that make scaling possible and exploring proven sequences that work within this model.
Join thousands of teams using SuperSend to transform their cold email campaigns and drive more revenue.