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It includes everything from the domains and mailboxes you use, to the DNS records that authenticate your messages, to the sending servers behind the scenes. For cold outreach, your infrastructure isn’t just about sending - it’s about deliverability. Properly configured and maintained infrastructure is what separates high-performing campaigns from ones that go straight to spam.
There are different infrastructure setups depending on your goals and budget.
The Forge Ecosystem gives you access to three infrastructure products tailored to different use cases.
It's the most robust and customizable option, ideal for businesses operating at scale who want dedicated resources and the ability to fine-tune every aspect of their sending setup. Infraforge, our private infrastructure product, also includes advanced features like multi-IP provisioning, API access, and a white-label option for resellers. It's ideal for agencies, large teams, or anyone scaling outbound with high sending volumes who wants dedicated resources and maximum reliability.
This setup offers fast deployment and lower costs but comes with less control, making it better suited for testing, early-stage campaigns, or smaller operations. Mailforge is our product with shared IP pools and fully automated DNS setup, it's the go-to option for newer teams, testers, or anyone needing a simple, low-maintenance way to start sending emails while absorbing some of the risk of spam complaints.
Primeforge delivers pre-configured Google Workspace and Microsoft 365 mailboxes with U.S.-based IP addresses. This setup is particularly effective when you're targeting business users on Google or Microsoft, as it enables ESP Matching - sending from the same provider your recipient uses - which significantly improves deliverability.
Setting up infrastructure doesn’t have to be painful.
But you do need to make smart choices to avoid deliverability issues and downtime.
Your infrastructure stack should match your stage and scale. Shared infrastructure like Mailforge works well when you're getting started, expecting a large number of spam complaints or looking for a budget solution. Primeforge is best when your target audience uses Google or Microsoft, giving you the benefit of ESP Matching.
Infraforge is built for scale, providing dedicated resources, control, and customizability for advanced users and teams with larger sending needs. In many cases, combining these types into a hybrid stack can help diversify risk and improve uptime.
To maintain healthy deliverability, each inbox should send no more than 30 to 50 emails per day. Typically, you can attach two to five mailboxes to a single domain. So if you're aiming to send 1,000 emails per day, you’ll need around 20 to 30 mailboxes spread across five to ten domains.
It's also essential to have additional mailboxes and domains warming up in the background. This ensures you always have fresh infrastructure ready to replace anything that gets burned or blacklisted.
Proper DNS configuration is essential. DNS records like SPF, DKIM, and DMARC act as authentication protocols to help mailbox providers trust your emails. SPF verifies who’s allowed to send on your behalf, DKIM ensures message integrity, and DMARC tells providers how to handle failed authentication checks.
All Forge infrastructure solutions handle DNS setup for you automatically, ensuring every domain and mailbox is configured correctly from day one.
Deliverability refers to whether your emails reach the primary inbox or end up filtered to spam. Your infrastructure setup plays a major role here. Poor configuration, no warm-up, or shared IPs with bad reputation can all tank your deliverability and harm your domain. The better your infrastructure setup, the better your inbox placement and reply rates.
When a new mailbox or domain starts sending cold emails without warming up first, it raises red flags with mailbox providers. That’s why we include Warmforge with every Salesforge subscription. Warmforge gradually builds sender reputation by simulating natural email behavior, like sending, receiving, and replying.
It’s fully automated, works with both Google and Microsoft, and helps ensure your mailboxes are trusted before your first campaign even launches.
Ideal if your prospects use Google Workspace or MS365 - using ESP Matching (sending from the same mailbox provider as your recipient uses) you can boost deliverability and make sure you land in their primary inbox.
Email infrastructure with a shared IP setup, perfect for when you’re just starting out or anticipating a large number of spam complaints.
Our most advanced, private email infrastructure made for heavy-hitters. With multi-IP provisioning and API, Infraforge is perfect for those needing customization and control at scale.
Email infrastructure refers to the technical setup behind your cold email campaigns - domains, mailboxes, DNS records, sending IPs, and more. It directly affects whether your emails land in your recipient’s inbox or get flagged as spam. Without a proper infrastructure setup, your cold outreach won’t scale, and deliverability will suffer.
Shared infrastructure means you’re using email resources (like IP addresses) alongside other senders. It’s easier to set up but comes with less control. Private infrastructure gives you full ownership and customization - ideal for high-volume or advanced users. ESP-native infrastructure uses trusted platforms like Google Workspace or Microsoft 365 to send emails, improving deliverability when targeting recipients on the same platforms.
That depends on your sending volume. A healthy mailbox should only send around 30 to 50 cold emails per day. For example, to send 1,000 emails per day, you’d need around 20 to 30 mailboxes spread across 5 to 10 domains. You should also keep extra domains and mailboxes warming up in the background to replace any that get burned.
Yes. Sending from a cold domain or mailbox without warm-up will almost certainly trigger spam filters. Warmforge, included with every Salesforge subscription, handles warm-up automatically so you can build reputation before launching outreach campaigns.
ESP Matching means sending emails from the same provider your recipient uses - like Gmail to Gmail or Outlook to Outlook. Providers tend to trust emails sent within their own ecosystem more, which increases your chance of hitting the primary inbox. Primeforge is designed to help you take advantage of ESP Matching by offering both Google and Microsoft mailboxes.
Domain burn is an unfortunate reality of cold outreach. That’s why we recommend maintaining a diverse infrastructure stack and always having unused domains and mailboxes warming up. If one domain is compromised, you can rotate in a new one without interrupting your sending schedule.
You’ll need SPF, DKIM, and DMARC records to authenticate your emails and build trust with email providers. If you’re using Mailforge, Infraforge, or Primeforge, all DNS records are automatically configured for you during setup - no manual work needed.
You should monitor metrics like health score, bounce rate, and inbox placement regularly. Warmforge gives you a health score for each mailbox (keep it above 97%), allows you to track bounce rates, and includes one free inbox placement test per month so you can see where your emails are landing.
Absolutely - and in fact, you should. A diversified infrastructure stack helps spread risk, increase inbox coverage, and ensure you always have healthy domains ready to send. Many high-performing outbound teams combine Primeforge, Mailforge, and Infraforge to balance control, volume, and deliverability.
If you’re early in your outbound journey, Mailforge is typically the best starting point. It’s easy to set up, cost-effective, and shields you from some of the risks of private infrastructure. As you scale, you can add Primeforge or Infraforge for high-volume, custom setups.
Cold emails are unsolicited messages, so mailbox providers apply much stricter filtering than they do for transactional or warm outreach. Sending more than 30 to 50 cold emails per day from a single mailbox increases the risk of spam flags, blacklisting, or even full account suspension - especially on platforms like Google Workspace or Microsoft 365. This limit isn't a hard technical cap; it's a best practice designed to keep your sender reputation healthy and ensure long-term inbox placement. Spreading volume across more mailboxes helps you scale safely.
Technically, yes - but it's risky. Some tools claim to offer "express" warm-up, but cutting the process short often leads to poor deliverability or immediate spam filtering. A two-week warm-up period is the minimum recommended time to simulate natural activity and build trust with mailbox providers. With Warmforge, the process is fully automated and designed to ramp up sending volume safely. If you rush it, you’re almost guaranteed to burn the mailbox before you even start your campaign.
Inbox placement tests show you where your emails are landing across different providers - Gmail, Outlook, Yahoo, and others. Instead of relying on open rates (which are increasingly unreliable), these tests reveal whether your emails go to the primary inbox, promotions tab, spam folder, or somewhere else. This insight is crucial because if your message never hits the inbox, it doesn’t matter how good your copy is - no one will see it. With Salesforge, you get one free placement test per month via Warmforge to help monitor performance and catch deliverability issues early.