Infraforge vs MailDeck: 8x Lower Cost, Same Infrastructure

Both Infraforge and MailDeck sell private SMTP inboxes with dedicated IPs for cold email. The difference is price. Infraforge charges approximately $4.00/inbox. MailDeck charges $0.50/inbox for the same infrastructure type. That is an 8x cost difference on a direct, like-for-like comparison.

MailDeck also provides two additional infrastructure types that Infraforge does not offer: Microsoft 365 Outlook (from $0.30/inbox) and Google Workspace (from $2.99/inbox). Teams can run all three under a single provider and diversify sending risk across official Microsoft IPs, official Google IPs, and dedicated SMTP IPs simultaneously.

MailDeck platform data from Q2 2026: 833K+ managed inboxes, 1,631+ clients, 7.5M+ emails/day, 270M+ lifetime, 3,000+ domains, 98% inbox placement rate.

This article compares SMTP pricing at multiple volume tiers, explains the infrastructure differences between each provider type, and identifies where each provider fits best. Infraforge pricing referenced from infraforge.ai/pricing as of May 2026.

The 8x Cost Difference: SMTP vs SMTP

The headline claim requires a like-for-like comparison. Both Infraforge and MailDeck offer private SMTP infrastructure with dedicated IPs. Here is the direct comparison across volume tiers.

SMTP Pricing at 100 Inboxes

At 100 SMTP inboxes, MailDeck costs $50/month. Infraforge costs approximately $400/month. That is a $350/month difference, or $4,200/year in savings on identical infrastructure.

SMTP Pricing at 500 Inboxes

At 500 SMTP inboxes, MailDeck runs $250/month. Infraforge runs approximately $1,500/month at its estimated volume-discounted rate. Annual difference: $15,000.

SMTP Pricing at 1,000 Inboxes

At 1,000 SMTP inboxes, MailDeck drops to $0.45/inbox ($450/month). Even at Infraforge's deepest estimated volume discount of $2.50/inbox, Infraforge still runs $2,500/month. Annual difference: $24,600.

At 5,000+ SMTP inboxes, MailDeck drops further to $0.40/inbox ($2,000/month). The savings grow larger at every volume tier.

For a full breakdown of cold email infrastructure costs across providers, see Cold Email Infrastructure Cost 2026.

Beyond SMTP: MailDeck's Additional Infrastructure Types

The SMTP comparison above covers where Infraforge and MailDeck compete directly. But MailDeck also provides two additional infrastructure types that Infraforge does not offer at all.

Microsoft 365 Outlook

MailDeck provisions Outlook inboxes on official Microsoft Azure IP pools. These IPs are whitelisted by default across virtually every receiving server because billions of legitimate emails flow through them daily.

• Outlook Normal: $30/tenant (100 inboxes) = $0.30/inbox
• Outlook Mixed: $35/tenant (100 inboxes) = $0.35/inbox
• Outlook Premium: $40/tenant (100 inboxes) = $0.40/inbox
• Pre-Warmed: $30/tenant (100 inboxes) = $0.30/inbox, ready to send immediately

Clients send 3-5 cold emails per inbox per day on Outlook Normal, or 8-10 per day on Outlook Premium, across domains with a minimum interval of 61 minutes between sends. Based on Q2 2026 MailDeck platform data.

Google Workspace

MailDeck provisions Google Workspace inboxes on official Google IP pools, which carry the highest trust score of any email infrastructure globally.

• Start Up: $39/month (10 inboxes) = $3.90/inbox
• Growth: $99/month (30 inboxes) = $3.30/inbox
• Enterprise: $299/month (100 inboxes) = $2.99/inbox

Why Multiple Infrastructure Types Matter

Running 100% of cold email volume through a single infrastructure type concentrates risk. If that provider's IP pool gets flagged or the platform changes policies, every inbox goes down at once. Spreading volume across Outlook, SMTP, and Google isolates each layer from the others.

For more on why diversification matters at scale, see Cold Email Infrastructure Diversification.

Diversified Stack Pricing

MailDeck offers bundled Diversified Stack plans that combine all three infrastructure types under a single subscription:

Infraforge does not offer a comparable multi-infrastructure bundle. Teams that want to diversify across Microsoft, Google, and SMTP would need to purchase Infraforge for SMTP and source Microsoft 365 and Google Workspace inboxes from separate providers, adding complexity and multiple vendor relationships.

Quick Comparison

Infrastructure Deep Dive

Infraforge: Private SMTP with Dedicated IPs

Infraforge builds custom SMTP servers and assigns dedicated IPs to each client. Your IP score depends entirely on your own sending behavior, and no other sender can affect it.

The tradeoff is that private SMTP starts with zero IP reputation. Every new IP must be warmed from scratch, which takes 3-4 weeks minimum. Enterprise mail servers that whitelist Microsoft and Google IPs by default will apply higher scrutiny to unknown SMTP IPs.

Infraforge operates exclusively on this single infrastructure type. Teams that need Microsoft 365 or Google Workspace inboxes would need to source those from a separate provider.

MailDeck: Three Equal Infrastructure Types

MailDeck provides inboxes across Microsoft 365 Outlook, Google Workspace, and Private SMTP. Each type runs on different infrastructure with different IP trust levels.

Microsoft 365 Outlook inboxes send through official Microsoft Azure IP pools. These IPs are whitelisted by default across virtually every receiving server. Google Workspace inboxes send through official Google IP pools, which carry the highest trust score of any email provider globally. MailDeck Private SMTP uses dedicated IPs per client, identical in model to what Infraforge provides.

The core difference: MailDeck gives teams the ability to distribute volume across all three infrastructure types under a single provider. A team running 1,000 inboxes can split 50% across Outlook, 30% across SMTP, and 20% across Google, isolating each channel from disruptions affecting the others.

To understand how shared vs. dedicated IP models affect deliverability in practice, see Shared IP vs Dedicated IP for Cold Email.

Where MailDeck Falls Short

Infraforge has genuine advantages in two areas within the inbox provider category.

Lower SMTP minimum purchase. Infraforge allows purchasing as few as 10 mailbox slots at approximately $40/month. MailDeck's SMTP minimum is 100 inboxes ($50/month). For teams that need fewer than 100 SMTP inboxes, Infraforge provides a more granular entry point. (MailDeck's lowest minimum across all products is 10 Google Workspace inboxes at $39/month.)

Faster SMTP setup. Infraforge advertises approximately 5-minute automated provisioning for SMTP mailboxes. MailDeck SMTP setup takes 24 hours. For teams that need SMTP infrastructure operational within minutes, Infraforge's speed is a real advantage. (MailDeck Google Workspace is instant, and Outlook tenants take 2-3 business days.)

Where MailDeck Wins

8x lower SMTP pricing. On a direct, like-for-like comparison of private SMTP infrastructure, MailDeck charges $0.50/inbox vs. Infraforge's $4.00/inbox. At 500 inboxes, the annual savings exceed $15,000. At 1,000 inboxes, annual savings reach $24,600 or more depending on Infraforge's volume tier.

Three infrastructure types instead of one. Infraforge provides private SMTP exclusively. MailDeck covers Microsoft 365 Outlook, Google Workspace, and Private SMTP equally. Teams can match infrastructure to their target audience and diversify sending risk across providers. A 1,000-inbox Diversified Stack (Outlook + SMTP + Google) costs $399/month on the Growth plan, which includes 215,000 cold sends per month.

Official Microsoft and Google IP pools. Infraforge sends through private SMTP servers where IP reputation is built from scratch. MailDeck Outlook inboxes send through Microsoft Azure IP pools, whitelisted by default. MailDeck Google Workspace inboxes send through Google IP pools, the highest-trust sending infrastructure globally. Enterprise recipients using Microsoft Exchange or Google Workspace give priority to emails from matching official IPs.

100 inboxes per domain on Outlook. Each MailDeck Outlook tenant includes 100 inboxes on a single domain. Infraforge provisions 1-3 mailboxes per domain. To run 1,000 inboxes, Infraforge requires 333-1,000 domains. MailDeck Outlook requires 10 domains. Fewer domains means simpler DNS management and lower domain acquisition costs.

Pre-warmed inboxes with zero warmup time. MailDeck offers Pre-Warmed Outlook tenants at $0.30/inbox that are ready to send cold email immediately. This eliminates the 3-4 week IP warmup period that private SMTP infrastructure requires.

Scale with managed infrastructure. MailDeck manages 833K+ inboxes across 1,631+ clients with automated SPF, DKIM, and DMARC configuration on all 3,000+ domains. Adding capacity means ordering additional tenants or inboxes. Infrastructure, DNS, and authentication are handled on the provider side.

Transparent published pricing. Every MailDeck product has fixed, published pricing. Outlook Normal: $30/tenant ($0.30/inbox). Outlook Premium: $40/tenant ($0.40/inbox). SMTP: $0.50/inbox (1-1K), $0.45 (1K-5K), $0.40 (5K+). Google Workspace: $39/month (10 inboxes), $99/month (30), $299/month (100). Infraforge's pricing page shows $4/mailbox at base rate, with volume discounts requiring direct inquiry.

FAQ

How much does Infraforge cost per inbox?

Infraforge charges approximately $4.00/inbox at standard volume for private SMTP. Dedicated IPs cost an additional $99/month each. Domains cost $14/year. At 100 mailboxes before IP costs, Infraforge runs approximately $400/month. Pricing referenced from infraforge.ai/pricing as of May 2026.

How does MailDeck SMTP compare to Infraforge SMTP on price?

On a like-for-like SMTP comparison, MailDeck charges $0.50/inbox (1-1K inboxes) while Infraforge charges approximately $4.00/inbox. That makes MailDeck 8x cheaper for the same infrastructure type. At 1,000 SMTP inboxes, MailDeck costs $450/month vs. Infraforge's estimated $2,500-$4,000/month. Annual savings range from $24,600 to $42,600.

Does Infraforge use Microsoft 365 or Google Workspace infrastructure?

Infraforge uses proprietary private SMTP servers with dedicated IPs. It does not send through official Microsoft or Google infrastructure. MailDeck provides all three: Microsoft 365 Outlook on official Microsoft Azure IPs, Google Workspace on official Google IPs, and Private SMTP on dedicated IPs.

What is the best infrastructure split for cold email at scale?

A recommended diversification ratio is 50/30/20: 50% Outlook Premium (bulk workhorse, official Microsoft IPs), 30% Private SMTP (volume buffer, replaceable if flagged), and 20% Google Workspace (premium layer, highest deliverability). The Growth Diversified Stack at $399/month delivers 215,000 cold sends per month across all three types.

Can I use MailDeck with my existing sequencer?

Yes. All MailDeck inboxes connect via SMTP to any sequencer: Instantly, Smartlead, Saleshandy, Apollo, Lemlist, Woodpecker, Reply.io, Snov.io, QuickMail, and any SMTP-compatible platform. MailDeck provides inboxes and infrastructure. Your sequencer handles scheduling and sequences.

What is MailDeck's minimum purchase?

Minimums vary by product: 2 Outlook tenants (200 inboxes, $60/month), 100 SMTP inboxes ($50/month), or 10 Google Workspace inboxes ($39/month). Infraforge requires a minimum of 10 mailbox slots at approximately $40/month. Both providers offer entry points under $60/month.

How long does MailDeck setup take compared to Infraforge?

Infraforge provisions mailboxes in approximately 5 minutes with automated DNS. MailDeck setup depends on the product: Google Workspace is instant, Private SMTP takes 24 hours, and Outlook tenants take 2-3 business days. All MailDeck products include automated SPF, DKIM, and DMARC configuration across 3,000+ managed domains.

Methodology

Infraforge pricing referenced from infraforge.ai/pricing as of May 2026. Volume discount estimates sourced from emailwarmup.com Infraforge review. MailDeck pricing sourced from published rates at maildeck.co as of Q2 2026. Deliverability context based on MailDeck platform data across 833K+ managed inboxes, 3,000+ domains, and 1,631+ clients. Infrastructure type classifications based on each provider's published documentation. No affiliate relationship exists between MailDeck and Infraforge.