Pre-warmed domains help you build trust with ISPs, improving email performance by 10% deliverability, 20% higher open rates, and 15% more replies. With 21% of emails ending up as spam, skipping this step can waste your time and resources.
Here are the top 5 providers for pre-warmed domains and what they offer:
Provider | Starting Price | Pre-Warmed Domains | Dedicated IPs | Best For |
---|---|---|---|---|
Infraforge | $17/month (10 slots) | ✓ | ✓ ($99/IP) | Tech users, scalability |
Instantly | $37/month | ✓ | ✓ | Mid-market firms |
Superwave.ai | Custom pricing | ✓ | ✓ | High-volume campaigns |
Warmy.io | $49/month | ✓ | ✗ | Small to midsize teams |
Buzzlead | Custom pricing | ✓ | ✓ | Enterprise clients |
These providers cater to different needs - from small teams to enterprise-level campaigns. Choose based on your budget, email volume, and technical requirements.
Our rankings were built around seven critical factors that drive success in cold email campaigns. Instead of relying on flashy marketing claims, we focused on real-world performance, using industry data and user feedback to create an accurate, reliable assessment.
Deliverability performance was at the top of our list. We closely examined how effectively each provider helps emails land in the inbox rather than getting stuck in promotional or spam folders. Research indicates that 70% of emails encounter spam-related issues that can block inbox placement. To evaluate this, we looked at factors like authentication protocols, sender reputation management, and warming processes. Providers offering dedicated IPs and strong authentication measures scored higher because these elements directly impact whether Internet Service Providers (ISPs) trust your emails.
"Deliverability is a measure of the health of your email marketing program, so it's important to do regular check-ups on your domain, IP, and authentication in particular to make sure you're up-to-date, just like how we all go to the doctor each year." - Carin Slater, Manager of Lifecycle Email Marketing at Litmus
Automation capabilities came next in importance. We evaluated how much manual effort each provider could eliminate through features like automated DNS setup, domain configuration, and warming processes. For instance, Infraforge can configure your first domain and mailbox in just 5 minutes, thanks to its automated technical setup. We also assessed tools that automatically monitor delivery rates, bounce rates, and sender reputation, which help users stay on top of their campaigns without constant manual intervention.
Integration flexibility was another key factor, especially for businesses already using outreach tools. We tested compatibility with popular platforms like Salesforge, Instantly, and other email-sending software. Providers offering APIs for seamless integration earned higher marks, as this allows businesses to connect their existing systems without limitations.
Transparent and upfront pricing played a major role, especially for U.S.-based businesses. We analyzed whether providers clearly disclosed their costs or relied on custom quotes. Additionally, we looked at value across different usage levels - some providers become more cost-efficient as you scale up, while others maintain flat rates. Hidden fees or unclear pricing structures led to lower rankings.
Scalability features were crucial for businesses planning to grow their email outreach. We reviewed how well each platform could handle increased email volumes, multiple domains, and team expansion without compromising performance. Providers that maintained high deliverability rates while supporting hundreds of mailboxes scored higher than those that struggled with scaling.
U.S.-based support quality was another key consideration. Support teams that operate during standard U.S. business hours and understand local regulations are essential for smooth operations. We evaluated response times, technical expertise, and availability, giving extra points to providers offering 24/7 support or dedicated account managers.
Finally, we considered additional infrastructure features that set providers apart. These included extras like dedicated IPs, SSL certificates, domain masking, and multi-IP provisioning. Such features often make the difference between basic warming services and professional-grade email infrastructure.
Our analysis revealed a wide range of offerings - some providers focus solely on warming, while others deliver a full suite of email infrastructure tools. The rankings reflect which providers offer the best blend of deliverability, automation, and overall value for cold email campaigns. In the next section, we’ll dive deeper into how each provider performed against these criteria.
Infraforge is a private email infrastructure platform tailored specifically for cold email outreach. Unlike traditional email services that use shared resources, Infraforge offers dedicated servers and IPs exclusively for your campaigns. This setup gives you full control over your sender reputation and deliverability. With automated technical configurations, domains and mailboxes can be up and running in just five minutes. Here's a closer look at its features, pricing, and key advantages.
Infraforge's architecture is built around dedicated IPs, ensuring that every mailbox has its own IP address. This eliminates the risks associated with shared IPs, protecting your sender reputation. The platform also takes care of technical essentials like DNS, DMARC, SPF, DKIM, and custom domain tracking, simplifying the process for users.
For businesses managing large volumes of emails, Infraforge provides multi-IP provisioning. This feature allows you to distribute your email sending across multiple dedicated IPs, reducing the chances of blacklisting and improving inbox placement. Agencies and larger teams will appreciate the Masterbox feature, which centralizes emails from multiple accounts into one unified system.
Security features include built-in SSL certificate provisioning and domain masking, which help protect your primary domains from any potential reputation issues. Infraforge also offers API access for seamless integration into existing systems. This allows users to automate mailbox provisioning and scale outreach efforts programmatically. Additionally, Infraforge integrates smoothly with popular email-sending tools like Salesforge and supports virtually any email sending software, ensuring quick and reliable campaign launches.
Infraforge uses a slot-based pricing model, where each mailbox slot is priced at $17 per month when billed annually. A minimum purchase of 10 slots is required, making the starting cost $170 per month. For high-volume users, the cost can drop to as low as $2.50 per mailbox, offering a cost-effective solution for larger operations.
Additional services include SSL and domain masking at $2 per domain per month, extra dedicated IPs at $99 per IP per month, and Masterbox access at $7 per workspace per month. Domain registration is available for $70 per year, and consulting sessions cost $500 each, with enterprise packages typically including two sessions. When compared to platforms like Google Workspace or Microsoft 365, Infraforge offers substantial savings for large-scale operations. For instance, managing 200 mailboxes with Infraforge costs approximately $651 per month, compared to $1,680 with Google Workspace or $1,200 with Microsoft 365. This pricing structure makes it a scalable option for high-volume campaigns.
Advantages
Limitations
After reviewing Infraforge, let's shift focus to Instantly, a platform built for speed. Instantly is an AI-driven cold email tool that provides pre-warmed email accounts, allowing users to kick off campaigns immediately - no waiting weeks to warm up new accounts. These accounts are based on U.S. IPs and come pre-configured with essential authentication protocols.
What sets Instantly apart is its pre-warmed email accounts, which enable users to launch campaigns right away. Traditional platforms usually require a warm-up period for new accounts, but Instantly eliminates that step. This makes it especially appealing for businesses that need quick deployment.
The platform is designed with scalability in mind. Users can add more pre-warmed accounts as their campaigns expand, making it an ideal choice for agencies or growing businesses. Instantly also offers alternative domains for testing new strategies or serving as backups. These domains help protect your primary domain's reputation while experimenting with messaging.
Another standout feature is domain forwarding, which allows users to redirect sending domains to their primary domain. This ensures brand consistency even when multiple accounts are in use. Instantly integrates seamlessly with its broader ecosystem, including tools like Unibox for reply management and an analytics dashboard for performance tracking.
To improve email deliverability, Instantly uses a warm-up process that mimics human-like conversations between accounts. This signals to email providers that the accounts and domains are legitimate, increasing the likelihood that emails will land in inboxes rather than spam folders. Instantly suggests starting with five emails per day per account and gradually increasing to 20–25 for optimal results.
Instantly offers pricing plans tailored to different business needs:
Instantly also offers Google accounts at a 20% discount compared to direct purchases. A 14-day free trial is available, giving users a chance to explore the platform before committing. All plans include unlimited email warm-up, a feature that many competitors charge extra for.
Here’s a quick breakdown of Instantly’s strengths and weaknesses:
Advantages
Limitations
Superwave.ai is a powerhouse infrastructure platform tailored for businesses that need to send thousands of emails daily. Instead of focusing on simplicity, it emphasizes raw sending capacity and top-notch deliverability - ideal for enterprise-level email campaigns. Its design reflects this focus, offering a feature set built for high-volume email outreach.
One of Superwave.ai's standout capabilities is its massive sending capacity. Users can send up to 5,000 emails daily per domain without enduring the usual lengthy warm-up periods. Starting with 797 emails on the first day, the system scales to 1,500 emails by day eight and 2,000 by day fifteen.
This impressive volume is achieved through its IP rotation system, which spreads emails across multiple IPs to minimize the chances of being flagged. The platform also includes automated DNS setup, seamlessly integrating this with its IP rotation and bounce management systems to ensure optimal deliverability.
Superwave.ai also features a bounce rate tracker that cleverly distributes bounces across multiple inboxes, safeguarding domain reputations. Its client slot system simplifies domain management, allowing users to replace problematic domains without disrupting ongoing campaigns.
For performance monitoring, the platform offers real-time deliverability tracking, keeping an eye on bounce rates, spam flags, and inbox placement. This helps users address potential issues before they affect campaign results. Eric Nowoslawski of Growth Engine X praised the platform's efficiency:
"I'm just gonna be completely honest. You can launch the next day. We found that giving it a week to warm up produces excellent results."
Superwave.ai claims to deliver 90-95% inbox placement by week two. However, its compatibility is limited to Smartlead and Instantly for campaign management.
Superwave.ai operates on a custom pricing model, tailored to each business's specific needs and scale. There are no standard pricing tiers - companies must contact the sales team for a quote. Costs depend on factors like sending volume, the number of domains, and infrastructure requirements. While this flexible approach caters to large-scale operations, it may deter smaller businesses looking for quick and transparent pricing.
Typically, the pricing covers domain setup, IP rotation infrastructure, bounce management, and ongoing deliverability monitoring. Given its capabilities, the platform is positioned at the higher end of the pricing spectrum.
Here's how Superwave.ai measures up for businesses considering it for high-volume email campaigns:
Advantages
Limitations
As summed up by Growth Engine X:
"Between not needing to warm it up and also the volume that we're able to do. It has just been an absolute game changer."
Superwave.ai is tailored for businesses that demand high email volumes and superior deliverability. While its advanced features make it a top choice for scaling email outreach quickly, its complexity and custom pricing may not align with the needs of smaller teams or less technical users.
Warmy.io takes a straightforward, user-friendly approach to email warm-up, offering an automated process designed to boost deliverability. By focusing on pre-warmed domain effectiveness, Warmy.io provides businesses with a seamless solution to improve email performance. The platform has received glowing user reviews, with 4.9/5 on Capterra (based on 50 reviews) and 4.8/5 on G2 (from 47 reviews).
Warmy.io’s standout feature is its AI-driven warm-up automation, which simulates human interactions. The system sends warm-up emails, gradually increasing their volume while ensuring they’re opened, replied to, and marked as important by real users. This approach avoids relying on artificial metrics, focusing instead on authentic engagement.
The platform includes real-time deliverability tracking through its dashboard, allowing users to monitor open rates, click-through rates, and bounce rates. This helps businesses quickly spot and address potential issues before they impact email campaigns.
Another highlight is Warmy.io’s customizable email content. Users can tailor the language and topics of warm-up emails, which is particularly helpful for businesses targeting specific audiences, such as those in the U.S. Additionally, the Email Template Checker analyzes factors like subject line length, word count, reading time, and the number of links to identify content that might trigger spam filters.
To ensure smooth email delivery, Warmy.io offers DNS record verification. It checks configurations like SPF, DKIM, DMARC, rDNS, MX-Record, and A-Record. The platform also provides an Email Deliverability Test, which identifies any issues with email content or sending processes before campaigns launch.
A unique feature is Warmy.io’s seed list warm-up strategy, which uses privately owned email addresses to provide real-time inbox placement data. This network-based method helps users build a positive sender reputation with email providers, making it a strong choice for businesses prioritizing simplicity in email deliverability.
Warmy.io offers clear pricing plans in USD, catering to businesses of all sizes:
Annual subscriptions include two months free, and a 7-day free trial lets new users test the platform risk-free.
While Warmy.io’s pricing is higher than basic options like Warmbox ($15/month) or Lemwarm ($29/month), it remains competitive compared to feature-rich alternatives like Mailwarm ($79/month per inbox).
Here’s how Warmy.io stacks up based on user feedback and its feature set:
Advantages
Limitations
Here’s what users have to say. Randall M., a Product Manager in the IT sector, shared:
"I like the automation and the simplicity, ease of use is unmatched."
Similarly, a Marketing Manager in the IT field noted in January 2025 that Warmy.io significantly improved their deliverability rates, boosting engagement and conversions. They rated the software 4.0/5 overall.
Warmy.io is an excellent choice for small to medium-sized businesses looking for a simple, effective email warm-up solution. While it may not offer all the customization options that technical users might want, its focus on automation and ease of use makes it a reliable tool for improving email deliverability and engagement.
Unlike providers that rely on self-service platforms, Buzzlead takes an agency-first approach, catering specifically to enterprises that need hands-on support. As a lead generation agency, Buzzlead specializes in full-service pre-warmed domain management and campaign oversight. With over 10 million cold emails sent across various industries, the company has developed a deep understanding of what works in today’s competitive email marketing landscape.
What truly distinguishes Buzzlead is its emphasis on expert-driven domain management. Instead of just offering tools, they provide a complete infrastructure solution. This approach is particularly appealing to U.S. enterprises that prefer to focus on their core operations while leaving email deliverability to seasoned professionals. Every aspect of their service reflects this expertise.
Buzzlead’s pre-warmed domain solution revolves around enterprise-grade infrastructure management, with a strong focus on seamless Outlook integration. They recommend using both G‑Suite and Outlook accounts combined with domain masking and IP redirection. This strategy distributes sender reputation across platforms, minimizing the risk of deliverability issues caused by relying on a single provider.
For clients scaling campaigns or targeting enterprise accounts, Buzzlead incorporates SuperWave inboxes into their recommendations. Their commitment to a testing-first methodology stands out - they encourage clients to experiment with multiple platforms to refine deliverability strategies, recognizing that email standards are constantly changing. Beyond tools, Buzzlead offers dedicated account management, with professionals handling technical tasks like domain warming, DNS configuration, and reputation management. This tailored approach ties directly into their exclusive pricing model.
Buzzlead’s pricing reflects its focus on serving mid-market to enterprise clients. While specific pricing details are not publicly disclosed, the company notes that it has reached capacity for its Beta testing phase and invites prospective clients to contact them for more information. This exclusivity suggests that Buzzlead works with a select group of high-value clients rather than offering solutions at scale.
To provide some context, competitors like IPwarmup.com offer plans ranging from $150 to $300 per month, while Mailscale’s pricing starts at $63 and goes up to $199 monthly. In contrast, Buzzlead’s full-service model caters to businesses with significant email volumes and budgets, offering an efficient way to outsource complex email infrastructure management.
Advantages
Limitations
Buzzlead is an excellent choice for established U.S. enterprises that value results-driven strategies and are comfortable outsourcing the complexities of email infrastructure management to a team of experts.
Below is a quick reference table summarizing the core features of various providers, offering a snapshot of their strengths to help you choose based on your needs, budget, and technical requirements.
Feature | Infraforge | Instantly | Superwave.ai | Warmy.io | Buzzlead |
---|---|---|---|---|---|
Starting Price | $17/month (10 mailboxes) | $37/month | Custom pricing | $49/month | Custom pricing |
Pre-Warmed Domains | ✓ | ✓ | ✓ | ✓ | ✓ |
Automated DNS Setup | ✓ | ✓ | ✓ | ✓ | ✓ |
Dedicated IPs | ✓ ($99/IP/month) | ✓ | ✓ | ✗ | ✓ |
SSL & Domain Masking | ✓ ($2/domain/month) | ✓ | ✓ | ✓ | ✓ |
API Integration | ✓ | ✓ | ✓ | ✓ | Limited |
Multiple Workspaces | ✓ | ✓ | ✓ | ✓ | ✓ |
Live Monitoring | ✓ | ✓ | ✓ | ✓ | ✓ |
CRM Integrations | Salesforge + API | HubSpot, Pipedrive | Zapier, Custom | Multiple CRMs | Custom setup |
Support Level | Self-service + Consulting | Self-service | Self-service | Self-service | Full-service |
Best For | Tech users, API scaling | Mid-market firms | AI-driven campaigns | Small to midsize teams | Enterprise clients |
Infraforge offers a starting price of $17/month for 10 mailbox slots, with optional add-ons to tailor your plan. This modular pricing model makes it appealing for users who want flexibility. Instantly and Superwave.ai, on the other hand, provide bundled features in the $37–$49/month range, while Warmy.io positions itself as a premium option at $49/month. Buzzlead operates with custom pricing designed for enterprise clients, offering full-service management.
Integration capabilities are a major factor when choosing a provider. Infraforge excels here with its robust API, enabling seamless integration with tools like Salesforge and other platforms. Instantly supports popular CRMs such as HubSpot and Pipedrive, while Superwave.ai relies on Zapier for automation and connectivity. Buzzlead and Warmy.io also offer integration options, though Buzzlead's setup is tailored to enterprise needs.
Providers fall into two main service categories: self-service and full-service. Infraforge, Instantly, Superwave.ai, and Warmy.io operate as self-service platforms, giving users control over their campaigns. Buzzlead, however, takes an agency-style approach, managing the entire process for clients at a higher price point.
Infraforge stands out for its advanced technical features, such as dedicated IPs, multi-IP provisioning, and domain masking, all hosted on private servers for added customization and security. Instantly, Superwave.ai, and Warmy.io also offer strong technical features, but with fewer options for granular customization.
When it comes to scaling, Infraforge's API-first design and programmatic scaling make it ideal for high-volume outreach. Instantly and Superwave.ai are well-suited for moderate scaling, while Warmy.io focuses on maintaining steady, stable volumes. Buzzlead can handle scaling too, but its selective client approach may not cater to extremely high-demand scenarios.
Choosing the right pre-warmed domain provider ultimately comes down to your specific business needs and goals. Each provider we've reviewed caters to distinct market segments, offering unique strengths that align with different operational priorities.
Infraforge stands out with its modular pricing and advanced features, making it a smart choice for tech-savvy businesses that require precise control and API-driven scalability. Instantly, on the other hand, appeals to mid-market firms with its strong CRM integration capabilities. For high-volume operations that rely on AI-driven campaign strategies, Superwave.ai is a natural fit. Warmy.io delivers premium reliability and robust features, making it ideal for small- to midsize teams, while Buzzlead takes on the heavy lifting for enterprise clients by managing the entire email infrastructure.
For U.S. businesses, the key factors to weigh are deliverability, cost-efficiency, and scalability. Startups working within tight budgets might lean toward modular pricing models, while companies experiencing rapid growth could benefit from providers offering API-based scalability or automation tools. Established enterprises, however, may prioritize full-service solutions or premium reliability to meet their more complex needs.
Before committing to a provider, take a close look at your current outreach demands and future growth potential. Integration capabilities are also crucial - providers offering native compatibility or broad CRM support can make your workflows more seamless and connected.
Remember, email deliverability is the ultimate measure of success. With email marketing offering a potential ROI of $36 for every $1 spent, the provider you choose can significantly influence your bottom line. Since 70% of emails encounter spam-related issues that prevent them from reaching inboxes, prioritizing deliverability features over unnecessary extras is often the smarter approach.
Start with a provider that aligns with your immediate needs but allows for growth as your business evolves. Focusing on deliverability, automation, and seamless integration will help you maximize the impact of your email marketing efforts.
Using pre-warmed domains can make a big difference in email deliverability. These domains come with an established positive reputation with email providers, which means your messages are less likely to end up in the spam folder and more likely to land directly in your audience's inbox.
Another advantage? Improved engagement. Pre-warmed domains can lead to better open and response rates - key factors in running successful outreach campaigns. With a trusted domain from the start, you can concentrate on creating impactful messages without stressing over technical hiccups or deliverability concerns.
When choosing a pre-warmed domain provider, it’s important to weigh factors like reputation, features, and pricing. A strong provider should offer tools like automated DNS setup, dedicated IPs, and reliable email deliverability solutions. Additional features such as real-time monitoring, SSL and domain masking, and easy integration with your current tools can streamline your workflow significantly.
Think about your specific requirements, too. Does the provider support bulk domain management? Do they offer API access for scaling or multi-IP provisioning? Opt for providers with a solid history in cold email infrastructure and scalable services to ensure your outreach efforts are both efficient and secure.
To ensure your emails actually make it to the inbox, start by authenticating your emails using protocols like SPF, DKIM, and DMARC. These steps build trust with email providers. Additionally, work with pre-warmed domains and IP addresses to establish a positive sender reputation from the get-go. Regularly cleaning your email list - removing invalid or inactive addresses - also helps maintain strong deliverability.
Be mindful of avoiding spam trigger words in your content, stick to a consistent sending schedule, and always include a clearly visible unsubscribe option to minimize spam complaints. Keep a close eye on key metrics like bounce rates and complaint rates to quickly spot and address any issues. By implementing these strategies, you’ll increase the likelihood of your emails landing in inboxes instead of being flagged as spam.