Stop treating cold email like a content problem. At scale, it's an infrastructure challenge that requires dedicated services for domains, inboxes, and deliverability.
Cold email services used to mean a simple sending tool. In 2025, it means managing a fleet of domains and inboxes to ensure deliverability.
Sending 100 emails a day from one inbox is easy. Sending 10,000 requires dedicated cold email infrastructure to avoid blacklisting your domain.
Poor deliverability isn't a tech problem; it's a revenue problem. Your cold email infrastructure directly impacts your pipeline generation.
Managing 50+ inboxes, domain rotation, and warmup manually is a full-time job. Cold email infrastructure services exist to automate this.
Most growth teams approach cold email with a simple playbook: buy a sending tool, connect their primary GSuite inbox, upload a list, and hit send. In 2018, that might have worked. You could brute-force your way to a few meetings.
In 2025, that approach is a direct path to the spam folder. Google and Microsoft's filtering algorithms are exponentially more sophisticated, domain reputation is fragile, and recovery is nearly impossible. Sending at any meaningful volume—more than 10k emails per month—isn't a copywriting challenge anymore. It's an infrastructure and deliverability engineering problem.
Relying on a single domain or a handful of inboxes is like building a skyscraper on a foundation of sand. The moment you apply real pressure, the entire system collapses. The modern playbook requires thinking like an infrastructure engineer, not a marketer.
The traditional approach to cold email is simple, intuitive, and dangerously wrong at scale. It involves one or two core domains (often the main corporate domain), a few primary inboxes, and a basic sending tool.
This setup fails for one critical reason: reputation is centralized and fragile. Every email sent, every bounce, and every spam complaint is tied to your single most valuable asset—your corporate domain. One poorly vetted list or an aggressive campaign can trigger spam filters, getting your domain flagged by services like Spamhaus.
The consequences are catastrophic. Suddenly, your team can't email existing customers. Your CEO can't email investors. Your invoices are going to spam. In 2025, you can't afford to mix your high-risk outbound operations with your mission-critical corporate communications. The systems are too sensitive, and the damage is too permanent.
An infrastructure-first approach treats cold email like a distributed system, designed for resilience and scale. Instead of a single point of failure, you build a network of assets that can handle high volume while protecting your core domain. The key components are:
Your infrastructure needs depend entirely on your sending volume and operational complexity. Here are three common tiers we see with high-growth teams.
The Starter Stack:
1-2 dedicated domains, 3-5 inboxes, enabling 75-125 cold emails/day (each inbox sends 25 cold + 25 warmup = 50 total/day) after a 2-3 week warmup. This is ideal for teams testing their first outbound motion or sending under 1,000 emails per month. The goal here is safety and learning.
The Growth Stack:
2-3 dedicated domains, 10-15 inboxes, enabling 250-375 cold emails/day (each inbox sends 25 cold + 25 warmup = 50 total/day) after a 3-4 week warmup. This is for teams that have validated their messaging and ICP and are ready to scale with multiple SDRs.
The Agency / Enterprise Stack:
5+ dedicated domains, 25-50+ inboxes, enabling 625-1,250+ cold emails/day (each inbox sends 25 cold + 25 warmup = 50 total/day) after a 4-6 week warmup. This is built for high-volume agencies managing multiple client accounts or enterprise teams with 5+ SDRs where deliverability is a core KPI.
Deploying a proper infrastructure isn't a one-day task. It's a methodical process.
Phase 1: Build the Foundation (Weeks 1-4)
Your only goal is to establish a healthy, warmed-up sending infrastructure. Purchase domains, set up inboxes, and configure SPF, DKIM, and DMARC records correctly. Start the automated warmup process. Do not send a single cold email. This phase is purely technical.
Phase 2: Deploy & Monitor (Weeks 5-8)
Begin sending low-volume campaigns (e.g., 10-15 cold emails per inbox per day). The goal is not to book meetings, but to gather data. Monitor deliverability metrics, inbox placement, and bounce rates. Establish a baseline for what 'good' looks like with your specific lists and messaging.
Phase 3: Scale & Rotate (Week 9+)
With a healthy baseline, you can gradually increase sending volume up to your infrastructure's capacity (approx. 25 cold emails/inbox/day). Implement automated rotation of domains and inboxes within your sequences. This distributes sending load and ensures no single asset is overused, maintaining long-term deliverability.
You could theoretically manage all of this yourself. You could buy the domains, manually configure dozens of inboxes, and build spreadsheets to track warmup schedules and rotation logic. But this creates a massive operational bottleneck and is prone to human error. It becomes a full-time job for a technical operator.
This is where cold email infrastructure services like SuperSend fit. A platform like SuperSend is not just another sequencer; it's the management and automation layer for your entire outbound infrastructure. It handles the tedious, critical tasks that determine success at scale:
Trying to use a CRM plugin or a simple sequencer for this is using the wrong tool for the job. They don't manage the underlying infrastructure, which is the part that breaks first at scale. A dedicated platform ensures your team can focus on strategy and messaging, not on whether your emails are landing in spam.
Join thousands of teams using SuperSend to transform their cold email campaigns and drive more revenue.