Stop putting all your emails in one basket

Let’s get one thing straight - if your entire cold email operation relies on one ESP, you’re playing with fire.

Google and Microsoft are not cold outreach platforms. They’re designed for internal comms, not outbound sales at scale. If you’re running everything through one ESP, you’re risking throttling, suspensions, and reputation bleed - all of which kill reply rates and tank your inbox placement.

That’s why top-performing teams are switching to a multi-ESP strategy, combining Infraforge or Mailforge (shared or private infrastructure) with Primeforge (premium ESP-based mailboxes) to scale cold outreach safely and profitably.

Why you need a multi-ESP strategy

A multi-ESP strategy means splitting your sending activity across multiple providers - not just for redundancy, but for:

• Deliverability control

• Inbox placement optimization

• Reputation diversification

• Higher throughput without penalties

And it’s not just about sending more - it’s about sending smarter.

5 strategic wins from combining Infraforge/Mailforge with Primeforge

1. You get the best of both worlds: volume + authenticity

Use Infraforge or Mailforge to run large-scale cold outreach - cost-effective and reliable.

Then layer in Primeforge to send from Google Workspace or Microsoft 365 mailboxes on US IPs. This creates sender diversity and makes your outreach look like real human emails coming from real inboxes.

Result? Higher inbox placement + scalable sending limits - without overloading a single system.

2. You protect yourself from ESP throttling and suspensions

Let’s face it: Google and Microsoft weren’t built for mass cold outreach. They rate-limit aggressively and penalize any behavior that looks like bulk sending.

By combining ESP-native mailboxes from Primeforge with SMTP infrastructure from Infraforge/Mailforge, you hedge risk. If one system gets throttled, the other keeps going - your pipeline never stalls.

3. You match your infra to the target ESPs

Deliverability improves when your ESP matches your recipient’s.

Use the free ESP Checker to identify what your leads are using, then choose whether to send via Primeforge (Google/MS365 mailboxes) or through your SMTP stack (Mailforge/Infraforge) based on that data.

4. You scale infrastructure without compromising warm up

Scaling outreach should never come at the cost of burned domains. With this combined strategy:

• Use Warmforge to warm up new domains/mailboxes across both stacks

• Ramp up safely while maintaining high sender reputation

• Avoid over-sending from any one domain, IP, or ESP

Whether you're warming up a Primeforge Gmail or a Mailforge SMTP domain, you’re doing it in parallel - not sequentially.

5. You can separate campaign types for better control

Segment your outreach by intent, target, or priority:

• Run volume-based campaigns (low-intent, large lists) via Mailforge or Infraforge

• Run high-priority, high-conversion campaigns via Primeforge mailboxes for inbox authenticity

This hybrid setup lets you assign the right infrastructure to the right use case - no more one-size-fits-all sending.

Running all your cold outreach from one ESP is like putting your entire sales pipeline on a single credit card - it works until it doesn’t.

By combining Mailforge or Infraforge with Primeforge, you build a resilient, diversified, and deliverability-first system that won’t break under pressure.

Want help building your own hybrid infrastructure? Reply to this email - we’ll walk you through it or set it up with you.