5 Strong Cold Email Infrastructure Providers for AI Agents
If you’re running AI agents for cold outreach, normal email infrastructure won’t work.
Those systems are built for humans, not for agents that create, send, and manage emails on their own.
AI agents need an API-based, automated, and scalable infrastructure that lets them set up domains, create mailboxes, warm them, and track deliverability without limits.
They need a system they can control programmatically from start to finish.
In this blog, you’ll discover 5 cold email infrastructure providers that let your AI agents handle everything, from domain setup to deliverability monitoring, fully by API.
TL;DR: 5 Cold Email Infrastructure Providers for AI Agents
Infraforge: Best for complete control with dedicated IPs, automated DNS, and private infrastructure built for AI-led scaling.
AgentMail: Built purely for AI agents. Lets them send, receive, and reply to emails autonomously through a clean, developer-first API.
Mailpool: Great for fast, bulk inbox creation and flexible scaling with shared IPs and automated DNS setup.
Mailforge: Simple, affordable cold email infrastructure with stable deliverability and quick setup.
Zapmail: Pre-warmed Google & Microsoft mailboxes with instant setup, workspace isolation, and full API automation.
Try Infraforge to give your AI agents full control over email setup, deliverability, and scaling, all in one place.
How Did We Choose the Best Cold Email Infrastructure Provider for AI Agents
We focused only on tools that are made for AI agents, not just regular cold email senders.
Here’s what we looked for:
- Tools that offer deep API access, allowing agents to create and manage inboxes, adjust settings, and monitor deliverability, all within a controlled, automated workflow.
- Automated setup for domains, DNS records, and warmup without manual work.
- Ability to scale quickly when hundreds of inboxes are needed.
- Strong deliverability setup with SPF, DKIM, and DMARC ready by default.
- Stability and safety for AI-driven sending at high volume.
- Systems designed to fit directly into AI workflows, not human dashboards.
Quick Comparison Table of Cold Email Infrastructure Tools for AI Agents
1. Infraforge
Infraforge is a private cold email infrastructure made for scaling AI-driven outreach safely. It helps you create thousands of domains and mailboxes with automated DNS setup, dedicated IPs, and prewarmed domains, all ready to send in minutes.
Infraforge’s API lets your AI agents create inboxes, manage DNS, and track deliverability automatically without any human input.
Infraforge also includes domain transferring, SSL, and domain masking, multiple workspaces, and real-time deliverability monitoring.
Everything is designed to make scaling cold outreach fast, safe, and fully automated.
Pricing
Infraforge keeps pricing simple.
- Starts at $4-$3 per mailbox per month, depending on volume
- Comes with automated DNS setup, inbox hosting, API access, and expert support
- A .com domain costs around $14 per year, and everything, from automated DNS setup to inbox hosting and API access, is included in your subscription.
If you want more control, you can add:
- SSL and domain masking for $2 a month (or $6 if you pay yearly)
- Dedicated IPs for $99 a month
- Masterbox, which gives a full workspace view, for $7 per month when billed yearly
Why It Is Better for AI Agents
- Let’s AI agents create inboxes, manage DNS setup, and track deliverability through the API
- Helps agents scale faster by automating all the technical setup, letting them send within minutes
- Keeps outreach consistent and safe with built-in warmup and rotation logic that prevents spam issues
- Ensures stable performance at scale, so AI agents can focus on sending and optimizing, not managing setup
- Makes it easy to maintain healthy domains, reducing downtime or deliverability loss during large-scale campaigns
Limitations
- Advanced add-ons like dedicated IPs or SSL can increase the total cost
2. AgentMail
AgentMail is the first email infrastructure built specifically for AI agents. It lets your agents send, receive, and reply to emails on their own.
Using the AgentMail API, AI agents can create inboxes instantly, manage messages, and act on incoming emails without any manual help.
It also supports SPF, DKIM, and DMARC by default to keep deliverability strong and reliable.
AgentMail lets you scale easily with unlimited inboxes, usage-based pricing, and built-in parsing for structured data, attachments, and threads.
Pricing
AgentMail offers simple plans for every stage:
- Playground Plan: Free forever and great for testing. You get 3 inboxes, 3,000 emails, and 3GB of storage to see how your agents handle email.
- Developer Plan: $20 per month and ideal for small projects. Includes 10 inboxes, 10,000 emails, 10GB storage, and full API access.
- Starter Plan: $100 per month and perfect for growing setups. Comes with 50 inboxes, 50,000 emails, 50GB storage, and 50 domains.
- Enterprise Plan: $500 per month for large operations. You get 300 inboxes, 300,000 emails, 300GB storage, and priority support.
- Custom Plan: Designed for big teams that need their own infrastructure, white-label setup, or dedicated support.
Every paid plan includes API access, webhooks, and custom domain support, so your AI agents can run everything automatically.
Why It Is Ideal for AI Agents
- Gives AI agents independent inboxes so they can communicate like humans without relying on Gmail or Outlook
- API makes it easy for agents to send, receive, and reply to emails in real time without human intervention
- Helps agents handle entire workflows like customer support, sales follow-ups, or account creation automatically
- Makes scaling simple and flexible with usage-based pricing and instant inbox provisioning
- Ensures secure and reliable delivery through built-in authentication and spam protection
Limitations
- Requires some basic development setup to integrate through the API
- Lacks built-in deliverability analytics, focuses more on agent communication than campaign monitoring
3. Mailpool
Mailpool is a cold email infrastructure tool built to help you create inboxes and domains in seconds. It’s made for teams that need to scale fast without worrying about setup or deliverability issues.
It lets you buy or import domains in bulk, create inboxes instantly, and set up automated SPF, DKIM, and DMARC for every new domain. With Mailpool’s AI Domain Generator and automated DNS setup, you can build a complete infrastructure in just a few minutes.
Mailpool also comes with rotating IPs, blacklist monitoring, unlimited inbox rotation, and over 150 native integrations. Its API makes it easy for AI agents or automation tools to manage inbox creation, warmup, and deliverability monitoring automatically.
Pricing
- Mailpool Plan – $2.60 per inbox/month (Billed annually)
Best for users who want affordable scaling. Includes AI domain generator, automated DNS setup, unlimited inbox rotation, rotating US/EU IPs, optimized deliverability, 150+ integrations, API, and live chat support. - Google Workspace Plan – $3.40 per inbox/month (Billed annually)
Ideal for users who want Gmail-based inboxes. Comes with a custom profile picture, Google rotating IPs, automated DNS setup, and all Mailpool features. - Microsoft 365 Outlook Plan – $4.30 per inbox/month (Billed annually)
Designed for users who prefer Outlook infrastructure with Microsoft IP rotation and complete deliverability setup. - Dedicated IP Plan – $170 per server/month (Billed annually)
Includes dedicated IPs, automated DNS, unlimited inbox rotation, and full API access for total control. - Dedicated Infrastructure – Custom pricing (Billed annually)
Offers a custom IP setup, white-label option, extended API access, and dedicated customer success manager for large-scale users.
All plans include AI domain generation, automated DNS setup, API access, and live chat support.
Why It Is Better for AI Agents
- Helps AI agents create inboxes and domains instantly.
- Mailpool API gives agents direct control over inbox rotation, domain setup, and deliverability monitoring.
- Automated SPF, DKIM, and DMARC ensure consistent inbox placement without manual effort.
- Keeps performance stable with US/EU IP rotation and blacklist monitoring.
Limitations
- The API doesn’t offer deep control for advanced AI logic, which can limit automation flexibility.
- Dedicated IP and custom infrastructure plans are costly for smaller teams.
- Focused more on bulk and manual scaling, not real-time autonomous control for AI agents.
4. Mailforge
Mailforge is a simple and affordable cold email infrastructure built to help teams of any size set up and scale fast.
It lets you create hundreds of domains and mailboxes in minutes, all pre-configured with SPF, DKIM, and DMARC through automated DNS setup.
Mailforge’s distributed infrastructure also supports SSL, domain masking, multiple workspaces, and works smoothly with any sending software.
Its API gives AI agents the ability to manage domains, create mailboxes, and maintain deliverability automatically.
Pricing
Mailforge keeps Pricing simple and affordable.
- It starts at $3 per mailbox each month, or $2 per mailbox if you choose yearly billing.
- A .com domain costs about $14 per year, and you get automated DNS setup, inbox hosting, and ongoing support included.
If you want a little more control, there are optional add-ons like:
- SSL and domain masking for $2 a month (or $6 if you pay yearly)
- Expert consulting sessions for $500 if you want personalized deliverability advice
Why It Is Better for AI Agents
- Reduces setup time for AI agents by automating DNS and all authentication records.
- Shared IP system helps agents send at scale safely by spreading sending volume across optimized servers
- API access allows agents to add or rotate inboxes dynamically, keeping deliverability high
- Designed for simple, plug-and-play automation, so agents can start sending right after setup
Limitations
- No AI-native deliverability tracking or real-time inbox health monitoring
- Shared IPs mean less control for teams that prefer dedicated or private infrastructure
- Doesn’t include outreach or reporting tools, focused only on setup and scaling
5. Zapmail
Zapmail is a cold email infrastructure tool that lets you create and manage Google and Microsoft mailboxes with automated DNS and high deliverability. You can also choose pre-warmed inboxes if you want to send immediately.
You can buy or connect domains, auto-generate mailbox names, and plug everything directly into your outreach tools in just minutes.
Its API lets your AI agents create mailboxes, manage domains, and check deliverability automatically.
Pricing
Zapmail keeps things simple with three main plans that include US/EU IP accounts, automated DNS setup, and instant mailbox creation:
- Starter Plan – $39/month
Best for freelancers or small setups. Includes 10 pre-warmed Google mailboxes, with extra mailboxes available at $3.50 each. - Growth Plan – $99/month
Ideal for mid-size agencies. Includes 30 mailboxes, with additional ones at $3.25 each. - Pro Plan – $299/month
Designed for large agencies. Includes 100 mailboxes, plus API access and priority support. Additional mailboxes are $3.00 each.
All plans include instant setup, automated DNS configuration, domain health checks, workspace management, and bulk profile customization.
You can upgrade anytime or add more mailboxes as you grow.
Why It Is Better for AI Agents
- Gives AI agents instant access to pre-warmed Google and Microsoft mailboxes, removing the waiting time for warmup
- Let's agents create, connect, and manage inboxes programmatically through its headless API
- Keeps campaigns running safely with workspace-level isolation and a unique domain per workspace
- Built-in DNS management ensures authentication and tracking are handled automatically for every new domain
- Allows agents to auto-generate domains, mailbox names, and branded personas to make communication feel more human-like
Limitations
- Zapmail mainly supports Google Workspace and Microsoft 365 mailboxes, so you don’t get the flexibility of running your own custom infrastructure
- Advanced AI features like adaptive deliverability scoring or auto-healing aren’t included
- Full API access is only available in the Pro plan, which can raise costs for small teams
Which Cold Email Infrastructure Should You Choose for AI Agents?
If you just need a basic setup, any of these tools can get your AI agents running.
But if you care about control, automation, and consistent inboxing at scale, here’s how they differ:
Infraforge gives you full control with dedicated IPs, automated DNS, and private infrastructure built for large-scale AI operations.
AgentMail is perfect if your AI agents need to send, receive, and reply to emails autonomously through a clean, developer-first API.
Mailpool focuses on fast, bulk setup, letting agents create inboxes and domains instantly with flexible scaling and shared IPs.
Mailforge keeps things simple with affordable infrastructure, free automated setup, and stable deliverability for cold outreach.
Zapmail is the fastest to start, offering optional pre-warmed Google and Microsoft mailboxes, instant DNS setup, and workspace isolation for safer scaling.
If your goal is to let AI agents send reliably at scale without human setup, Infraforge gives you the best mix of automation, performance, and deliverability.
Try Infraforge today! And get full control over your AI email infrastructure and scale safely.