Email infrastructure for AI SDRs

Scaling AI outreach isn’t just about automation - it’s about architecture

AI SDRs can send faster, smarter, and around the clock. But that speed is a double-edged sword.

If your infrastructure isn’t built for scale, your domains will burn long before your pipeline fills.

AI doesn’t get tired - but it can get throttled.

Every additional contact your AI SDR reaches means another domain, mailbox, and ESP needs to be ready to handle it safely.

AI changes everything about email infrastructure

With a human SDR, volume is predictable - 100 to 150 emails per day. With an AI SDR like Agent Frank, that same effort can be multiplied tenfold.

The problem is that most teams try to plug AI into fragile setups built for human senders - single ESP, minimal warm-up, no rotation, no redundancy.
AI will expose those weaknesses instantly.

You’re not just scaling activity - you’re scaling risk. Let’s talk about how you can avoid all the headaches that come with that.

The new email architecture: distributed and diversified

AI SDRs demand infrastructure that’s both scalable and resilient.
That means:

• Domain pooling - multiple sending domains per campaign to distribute load and reduce reputation risk.

• Mailbox rotation - spreading sends evenly to prevent one mailbox from getting flagged or throttled.

• Multi-ESP strategy - matching the right sending environments (Gmail, Outlook, private SMTP) for volume and stability.

• Warm-up orchestration - continuous warming and monitoring to maintain heat scores across your sending pool.

Your AI SDR should be able to process thousands of contacts without a single point of failure - that’s what modern infrastructure makes possible.

Here’s the rule of thumb: The more contacts you want Agent Frank (or another AI SDR) to have in his monthly pipeline, the more mailboxes you need to handle them safely.

Agent Frank is built to scale linearly - more mailboxes = more volume, without risking deliverability.

You can:

• Add your own external mailboxes, or

• Use our dedicated infrastructure solutions built specifically for AI SDR operations.

Your infrastructure options

Infraforge: Private email infrastructure for precision control

If you want full control and privacy, Infraforge is your foundation.
You get:

• Advanced features like SSL, domain masking, and multi-IP provisioning.

• Private infrastructure that isolates your deliverability environment from shared systems.

• Full configurability for agencies, power users, and AI SDR operators who want to own every detail.

Starts at $33 / month (billed annually) for 10 mailboxes.

Megaforge (Premium): Built specifically for Agent Frank

If you want maximum deliverability with zero management, this is the one.

Megaforge automatically distributes Frank’s sending across multiple ESPs, so if one provider throttles or “burns,” there’s always a fallback.

Every plan includes smart distribution:

• 20 mailboxes (base plan) evenly split across Gmail, Outlook, Mailforge, and Infraforge.

• Each mailbox sends ~15 emails/day for a total of ~300 high-quality sends per day.

• Auto-balancing keeps your reputation even across all providers.

Starts at $69 / month for 20 mailboxes.

Warm-up: Your 2-week runway to inbox success

After setup, your mailboxes need time to “stretch their legs.” That’s where Warmforge comes in.

Warmforge automatically warms your domains and mailboxes over two weeks - no manual setup, no extra cost. During that time, sending gradually ramps up to build a natural sending reputation with ISPs, ensuring your AI SDR’s first emails land in inboxes, not spam.

Once the warm-up phase ends, you’re ready to scale outreach confidently - whether you’re using Infraforge, Megaforge, or your own connected mailboxes.

AI SDRs don’t fail because of copy. They fail because of poor infrastructure.

If you want Agent Frank (or another AI SDR) to perform like a real SDR team - personalized, consistent, and scalable - he needs the infrastructure to match.

1. Decide how many contacts you want your AI SDR to manage.

2. Match that volume with the right infrastructure.

3. Let Warmforge prep your domains automatically.

Once it’s ready, you can sit back and watch your AI SDR handle the hard part - finding, messaging, and booking meetings on autopilot.

Book a demo with our team to discuss a custom set up for you: