Mailforge Alternative: Full Stack vs SMTP-Only

Mailforge provides SMTP mailboxes on a shared IP pool at $3/mailbox per month. MailDeck provides three infrastructure types: Microsoft 365 Outlook starting at $0.30/inbox, Google Workspace at $2.99/inbox, and Private SMTP at $0.50/inbox with dedicated IPs per client. This is a comparison between a single-infrastructure SMTP provider and a multi-provider stack covering three distinct IP ecosystems.

MailDeck manages 833K+ inboxes across Microsoft 365, Google Workspace, and SMTP for 1,631+ clients, processing 7.5M+ emails per day with a 98% inbox placement rate across all properly configured domains. Based on Q2 2026 MailDeck platform data.

Mailforge pricing verified on mailforge.ai/pricing as of May 2026.

Quick Comparison

Pricing Comparison at Scale

Mailforge Pricing

Mailforge charges $3 per mailbox per month on annual billing ($2.50/mailbox with 2 months free promo factored across the year). Monthly billing runs approximately $3.75/mailbox. Domains are purchased separately at $14/year for .com TLDs. An optional SSL and domain masking add-on costs $2/domain/month.

The minimum purchase is 10 mailbox slots. Mailboxes can be deleted and recreated within the slot allocation without additional charges.

MailDeck Pricing

MailDeck covers three infrastructure types, each with its own pricing.

Microsoft 365 Outlook (100 inboxes per tenant):

Google Workspace (5 inboxes per domain):

Private SMTP (dedicated IP per client, 5 inboxes per domain):

Diversified Stack (all three combined):

Minimum orders: Outlook 2 tenants (200 inboxes, $60/mo), Google Start Up (10 inboxes, $39/mo), SMTP 100 inboxes ($50/mo).

Cost at 100 Inboxes

At 100 inboxes, Mailforge costs $300/month on shared IPs. MailDeck Outlook Normal costs $30/month on official Microsoft IP pools. That is a 10x price difference with MailDeck running on provider-level infrastructure instead of shared SMTP.

Comparing SMTP to SMTP directly: MailDeck Private SMTP costs $50/month for 100 inboxes on a dedicated IP. Mailforge costs $300/month for 100 mailboxes on shared IPs. The SMTP-to-SMTP gap is 6x while MailDeck also eliminates shared IP risk.

Cost at 500 Inboxes

At 500 inboxes, MailDeck Outlook Normal saves $1,350/month over Mailforge. That is $16,200 in annual savings. MailDeck Private SMTP saves $1,250/month, or $15,000 annually, while providing a dedicated IP instead of a shared pool.

For a comparison across all cold email infrastructure providers at this scale, see our 11-provider pricing analysis.

Cost at 1,000 Inboxes

At 1,000 inboxes, Mailforge costs $3,000/month. MailDeck's Diversified Stack Growth plan provides 1,130 inboxes across all three infrastructure types for $399/month. That is a 7.5x cost difference while adding Microsoft and Google IP diversity to the stack.

The Diversified Stack spreads volume across Outlook for bulk outreach, Google Workspace for enterprise targeting, and SMTP for volume buffer. This approach reduces single-provider exposure, which is especially relevant when scaling past 1,000 inboxes.

Cost at 5,000 Inboxes

At 5,000 inboxes, Mailforge costs $15,000/month. MailDeck Outlook Normal costs $1,500/month. That is a 10x difference, translating to $162,000 in annual savings.

At this scale, MailDeck's Diversified Stack Enterprise plan provides 11,300 inboxes for $3,499/month. That covers more than double the inbox count at less than a quarter of Mailforge's cost for 5,000 mailboxes.

Infrastructure Comparison

IP Architecture: Shared Pool vs Three Dedicated Models

The core architectural difference between Mailforge and MailDeck is the IP model.

Mailforge distributes mailboxes across a shared IP pool. Their documentation describes this as "distributing your mailbox accounts among millions of businesses." In a shared pool, your sender reputation is partially determined by the behavior of every other sender sharing those IPs. One aggressive sender can trigger IP-level blacklisting that affects all users on the same pool.

MailDeck uses three distinct IP models with zero shared IP exposure across any product.

MailDeck manages 833K+ inboxes across 3,000+ domains with a 98% inbox placement rate. Based on Q2 2026 platform data covering 270M+ cold emails sent lifetime.

For a deeper analysis of how IP models affect deliverability, see our shared IP vs dedicated IP comparison.

Provider Diversity vs Single Infrastructure

Mailforge operates on one infrastructure type: SMTP with shared IPs. Every mailbox routes through the same server architecture and the same IP pool.

MailDeck covers three infrastructure types under one account. Each type serves a different purpose in a diversified sending stack.

The recommended diversification approach splits volume across all three providers: 50% Outlook for bulk sending, 20% Google Workspace for premium segments, and 30% SMTP for volume buffer. If one provider tightens policies or experiences deliverability shifts, the other two continue operating on entirely separate IP ecosystems.

Setup and Warmup

Mailforge provisions mailboxes in approximately 5 minutes with automated DNS configuration. This is the fastest setup time among cold email infrastructure providers.

MailDeck setup times vary by infrastructure type. Google Workspace provisions instantly. Private SMTP is ready in 24 hours. Outlook tenants take 2-3 days with full DNS propagation and authentication verification.

Where MailDeck Falls Short

Mailforge holds three legitimate advantages as an inbox provider.

Lower minimum and faster provisioning. Mailforge allows purchasing as few as 10 mailbox slots at $30/month with 5-minute setup. MailDeck's lowest entry point is 10 Google Workspace inboxes at $39/month with 2-3 weeks of warmup before cold sending. For Outlook, the minimum is 200 inboxes at $60/month with 2-3 days of setup. Teams running small-scale tests or solo operations can get started faster and cheaper with Mailforge.

Built-in domain purchasing. Mailforge sells .com domains at $14/year directly through the platform. MailDeck requires teams to bring their own domains. This adds a procurement step for teams setting up new infrastructure from scratch.

Higher per-inbox Google Workspace pricing at small scale. MailDeck's Google Workspace Start Up plan costs $3.90/inbox for 10 inboxes. At this price point, MailDeck's Google product costs $0.90 more per inbox than Mailforge's SMTP. This gap narrows at the Enterprise tier where Google Workspace drops to $2.99/inbox, and reverses entirely when comparing MailDeck's Outlook or SMTP products.

Where MailDeck Wins

Lower cost per inbox at every scale above the minimum. MailDeck Outlook Normal costs $0.30/inbox. At 500 inboxes, that is $150/month versus Mailforge's $1,500/month. At 1,000 inboxes, the gap reaches $2,700/month. At 5,000 inboxes, the annual savings exceed $162,000. Even MailDeck's SMTP product at $0.50/inbox undercuts Mailforge by 6x while providing dedicated IPs instead of a shared pool.

Three infrastructure types under one provider. Mailforge provides SMTP exclusively. MailDeck covers Microsoft 365 Outlook, Google Workspace, and Private SMTP. Teams can match infrastructure to their target audience: Google for enterprise decision-makers, Outlook for high-volume SMB campaigns, SMTP for buffer and testing. The Diversified Stack plans combine all three into a single subscription.

Zero shared IP risk. MailDeck uses official Microsoft IP pools for Outlook, official Google IP pools for Google Workspace, and dedicated IPs per client for SMTP. Mailforge's shared pool means your sender reputation is partially tied to other users' behavior. One aggressive sender on the same IPs can trigger blacklisting that affects your deliverability.

100 inboxes per Outlook domain. MailDeck Outlook tenants include 100 inboxes per domain. At 1,000 inboxes, MailDeck Outlook needs 10 domains. Operating fewer domains means less DNS management overhead and fewer domains to monitor for burn signals.

Scale economics that widen at volume. Mailforge's $3/mailbox pricing is flat. MailDeck's SMTP pricing drops from $0.50 to $0.40/inbox at 5,001+ inboxes. The Diversified Stack Enterprise plan provides 11,300 inboxes across three infrastructure types for $3,499/month. Volume pricing and multi-product bundling create a cost advantage that grows at every tier.

Official provider IP trust for enterprise recipients. Corporate mail servers on Microsoft Exchange or Google Workspace inherently trust emails arriving from official Microsoft and Google IP pools. These IPs are whitelisted by default because billions of legitimate emails flow through them daily. SMTP infrastructure built on shared pools lacks this provider-level trust signal, which matters most when targeting enterprise recipients.

FAQ

How much does Mailforge cost?

Mailforge charges $3 per mailbox per month on annual billing, with a minimum of 10 mailbox slots. Monthly billing runs higher at approximately $3.75/mailbox. Domains are purchased separately at $14/year for .com TLDs. An optional SSL and domain masking add-on costs $2/domain/month. At 500 mailboxes, the total monthly cost is approximately $1,500 plus domain fees. Current pricing is available on mailforge.ai/pricing.

How does MailDeck compare to Mailforge on price?

MailDeck ranges from $0.30/inbox (Outlook Normal) to $3.90/inbox (Google Workspace Start Up). At 1,000 inboxes, MailDeck Outlook Normal costs $300/month versus Mailforge at approximately $3,000/month. MailDeck Private SMTP at the same scale costs $500/month with dedicated IPs. The price gap widens at 5,000 inboxes where MailDeck SMTP drops to $0.40/inbox ($2,000/month) versus Mailforge at $15,000/month. For inbox count planning, see our inbox calculator.

Does Mailforge use shared or dedicated IPs?

Mailforge uses a shared IP pool, distributing mailboxes among what they describe as "millions of businesses." MailDeck uses three separate IP models: official Microsoft pools for Outlook (whitelisted by default across virtually every receiving server), official Google pools for Google Workspace (highest global trust), and dedicated IPs per client for Private SMTP. None of MailDeck's products share IPs between clients.

MailDeck manages 833K+ inboxes across 1,631+ clients with a 98% inbox placement rate on properly configured domains. Based on Q2 2026 platform data.

Can I use MailDeck with Instantly or Smartlead?

Yes. MailDeck is infrastructure only and provides SMTP credentials that work with any sequencer. Supported tools include Instantly, Smartlead, Saleshandy, Apollo, Lemlist, Woodpecker, Reply.io, Snov.io, QuickMail, GMass, and any other SMTP-compatible platform. Your sequencer choice does not affect deliverability. The inbox type determines approximately 60% of deliverability outcomes, with domain health and copy quality covering the remaining 40%.

What infrastructure types does MailDeck support that Mailforge does not?

Mailforge provides SMTP-only infrastructure on shared IPs. MailDeck provides three infrastructure types: Microsoft 365 Outlook with official Microsoft IP pools (100 inboxes per tenant, $0.30-0.40/inbox), Google Workspace with official Google IP pools (5 inboxes per domain, $2.99-3.90/inbox), and Private SMTP with dedicated IPs per client ($0.40-0.50/inbox). The Diversified Stack plans combine all three under one account. Teams can segment their sending by audience: Google for enterprise, Outlook for volume, SMTP for buffer.

Which provider is better for high-volume cold email at 5,000+ inboxes?

At 5,000 inboxes, Mailforge costs approximately $15,000/month on shared IPs. MailDeck Outlook Normal costs $1,500/month on official Microsoft IPs. MailDeck Private SMTP costs $2,000/month on dedicated IPs. The Diversified Stack Enterprise plan provides 11,300 inboxes across all three infrastructure types for $3,499/month. At enterprise scale, IP isolation and multi-provider diversification become critical for maintaining deliverability. MailDeck manages 833K+ inboxes across 1,631+ clients at this scale.

Is Mailforge good for cold email?

Mailforge provides SMTP mailboxes built specifically for cold outreach with automated DNS setup and 5-minute provisioning. The shared IP model works for teams sending moderate volumes who want quick setup and a low entry point. For teams scaling past a few hundred inboxes or targeting enterprise recipients, the shared IP pool introduces reputation risk from other users on the same infrastructure. The $3/mailbox pricing also becomes expensive at scale compared to dedicated infrastructure providers with volume pricing.

Methodology

Mailforge pricing verified on mailforge.ai/pricing as of May 2026. Infrastructure details sourced from mailforge.ai product documentation. MailDeck pricing from published rates at maildeck.co. MailDeck platform data based on Q2 2026 metrics: 833K+ managed inboxes, 1,631+ clients, 7.5M+ daily emails, 270M+ cold emails sent lifetime, 3,000+ domains under management, 98% inbox placement rate. Mailforge does not publish sending limits or inboxes-per-domain specifications on their website. Check mailforge.ai for current Mailforge rates.

Last updated: May 2026