Infraforge
Infraforge (formerly Mailforge) automates the purchase and setup of secondary domains and mailboxes for cold email campaigns. It buys domains from registrars, configures DNS (SPF, DKIM, DMARC), provisions mailboxes (Gmail Workspace or Outlook), and hands you ready-to-use infrastructure. Teams use Infraforge when they are scaling to dozens of domains and do not want to manage setup manually.
Official site ↗Why it ranks here
Infraforge ranks as niche because most sending platforms (Smartlead, Salesforge) handle rotation and warmup without needing dozens of domains. Infraforge is valuable when you are sending at massive scale (50K+ emails/day) and need many domains to protect sender reputation. For most teams, 2-5 manually-configured domains are enough.
Where it sits
Infraforge ranks as niche because the need is narrow. It automates a painful process (buying and configuring domains), but the process is only painful at scale. If you are sending under 20K emails/day, manual setup is fine. If you are above that, Infraforge saves hours per domain.
How GTM Engineering teams use it
Engineers specify how many domains and mailboxes they need, and Infraforge provisions them automatically. Once provisioning is complete, engineers connect the mailboxes to their sending platform (Smartlead, Instantly) and launch campaigns. Infraforge monitors domain health and alerts when reputation drops. Teams rotate domains regularly to keep sender reputation high.
In-depth notes
Pricing includes domain registration, mailbox costs (Google Workspace or Outlook fees), and Infraforge service fees. The automation saves time but adds cost. Best for teams sending at high daily volume who need to rotate across many domains. For smaller teams, manually buying domains and configuring DNS is cheaper and sufficient.
Best for
High-volume senders (50K+ emails/day) who need automated domain and mailbox provisioning.
Avoid if
You are sending under 20K emails/day or can manage domain setup manually.
The rest of Sending & deliverability
Smartlead Leader High-volume cold email with mailbox rotation and inbox monitoring. #2 
Instantly Leader Affordable cold email sending with built-in mailbox warmup. #3 
lemlist Strong Cold email with strong personalization (video, images, dynamic landing pages). #4 
Salesforge Strong AI-powered cold email with built-in mailbox and domain provisioning. #5 
QuickMail Strong Simple cold email sending with inbox rotation and basic analytics. #6 
Mailreach Strong Dedicated mailbox warmup and inbox placement testing. #7 
Woodpecker Situational Cold email automation with strong CRM integration and follow-up logic. #8 
GlockApps Situational Inbox placement testing across Gmail, Outlook, Yahoo, and other providers. #9 
Warmup Inbox Situational Automated mailbox warmup by simulating engagement across a network. #10 
Warmy.io Niche Mailbox warmup with deliverability monitoring and spam testing. #11 
Amazon SES Niche Raw email sending infrastructure (SMTP/API) for custom-built outbound systems. Learning guide
Setup
Specify the number of domains and mailboxes you need, and Infraforge automates domain purchase, DNS configuration (SPF, DKIM, DMARC), and mailbox provisioning (Google Workspace or Outlook). Connect provisioned mailboxes to your sending platform (Smartlead, Instantly) after provisioning completes.
First thing to build
After Infraforge provisions 10 domains and 50 mailboxes, connect them to your sending platform and enable warmup. Launch high-volume campaigns (10K+ emails per day) distributed across the mailbox pool. Monitor domain health in Infraforge and rotate to fresh domains when reputation drops.
What actually matters
- Domain rotation strategy: rotate to new domains every 30-60 days or when reputation degrades to protect long-term deliverability
- Cost management: includes domain registration, mailbox subscription (Google or Outlook), and Infraforge service fees
- Health monitoring: Infraforge tracks domain reputation and alerts when issues arise
- Scale planning: provision domains in batches ahead of volume increases to ensure warmup completes before campaigns launch
Watch out
Automated provisioning adds cost; only use Infraforge if manual domain setup becomes a bottleneck at high volume.