Alternatives
Jan 19, 2026
CEO and co-founder
Maildoso Alternatives: Complete Comparison Guide for Cold Email Agencies
Why agencies switch from Maildoso
Cold email infrastructure includes three components: domains, inboxes, and the IP addresses those inboxes send from. Maildoso bundles these together with automated SPF, DKIM, and DMARC configuration, which saves setup time. But the infrastructure underneath, specifically shared IPs and per-inbox pricing, creates problems that compound as you scale.
Maildoso uses IP rotation to send campaigns from several different IP addresses, distributing sends across a shared pool. This sounds like a feature until you understand what "shared" actually means for your deliverability.
The impact of shared IPs on deliverability
A shared IP is an IP address used by multiple senders at the same time. Since the IP is shared, the sending reputation is shared too. Your email deliverability rate does not depend only on your behavior. It is affected by everyone else sending from that IP.
Think of it like an apartment building. If another resident in your building starts sending spam or hosts malware, the entire building's address can get blacklisted or flagged. One bad campaign can hurt everyone using the same IP.
The technical explanation from Elementor's IP comparison guide confirms this risk: "The primary risk is the 'bad neighbor' effect. If another resident in your 'apartment building' (a site on your shared IP) starts sending spam or hosts malware, the entire building's address can get blacklisted."
This is exactly what Maildoso users report experiencing. Agency founders on G2 describe scenarios where their inboxes get affected quickly despite taking preventative measures, and some report having domains burned due to platform-wide issues affecting the shared infrastructure. These complaints highlight the fundamental vulnerability of shared IP pools.
With dedicated IPs, your behavior alone determines ESP trust. You control your reputation instead of inheriting someone else's problems. Our dedicated IP vs shared IP pools video demonstrates these differences with real campaign data.
How per-inbox pricing hurts agency margins
Maildoso's pricing starts at $100/month for 32 mailboxes according to their official pricing page, which works out to roughly $3.10 per inbox. At their highest volume tier (400 mailboxes), the per-inbox cost drops to around $1.80, but you are still paying $733/month.
Here is why this model breaks agency economics:
Inbox Count | Maildoso Cost | Google Workspace Cost | Inframail Cost |
|---|---|---|---|
50 inboxes | ~$137/month | $350-420/month | $129/month |
100 inboxes | ~$200/month | $700-840/month | $129/month |
200 inboxes | ~$400/month | $1,400-1,680/month | $327/month |
Maildoso costs estimated using mid-tier per-inbox pricing (~$2.00/inbox). Google Workspace uses Business Starter annual rate ($7/user). Inframail uses Unlimited Plan flat rate ($129/month) and Agency Pack ($327/month).
The problem compounds because client revenue does not scale linearly with inbox count. Adding three new clients might require 30 more inboxes, increasing your Maildoso bill by $60-90/month while your retainer revenue only increases by $6,000-15,000/month. The infrastructure cost as a percentage of billings stays roughly constant or grows.
For an agency billing $2,000-5,000/month per client (typical retainer range), infrastructure should stay under $500-1,250/month per client to maintain healthy 25-30% margins. At 100 inboxes spread across 5 clients (20 inboxes per client), Maildoso costs approximately $40/month per client just for inboxes. Google Workspace costs $140-168/month per client. Inframail costs $25.80/month per client ($129 ÷ 5). These platform costs represent 2-8% of client billings before adding domains, warmup, and sending platforms.
With flat-rate pricing, the math inverts. Your infrastructure cost stays fixed at $129/month (or $327/month for the Agency Pack) whether you run 50 or 200 inboxes. As you add clients, your margins expand instead of compress.
"So affordable that it will make your unit economics work, even for lower ticket b2b businesses like ours." - Verified user review of Inframail
Top 5 Maildoso alternatives for cold email agencies
I have tested and evaluated the major infrastructure providers based on what actually matters for agencies: cost at scale, IP reputation control, setup speed, and support quality. Here is how they stack up.
1. Inframail
Best for: Agencies scaling past 50 domains who want dedicated IPs and flat pricing without manual DNS work.
Inframail automates Microsoft email infrastructure setup. You purchase domains through the platform or migrate existing domains, and the platform configures SPF, DKIM, and DMARC records automatically. No DNS panel access required. The Inframail FAQ covers the full technical setup process.
Key features:
Unlimited email inboxes at $129/month (Unlimited Plan) or $327/month for Agency Pack with 3 dedicated IPs
Dedicated US-based IPs (1 on Unlimited, 3 on Agency Pack)
Automated SPF/DKIM/DMARC configuration
Blacklist monitoring with auto-delisting requests
Built on Microsoft's cloud platform with enterprise partnership announced January 2024
Pros:
Flat-rate pricing eliminates per-inbox cost creep
Dedicated IPs isolate your sending reputation
Setup speed is exceptional. Users report setting up 10 inboxes in approximately 10 minutes
Cons:
No built-in warmup tool (requires external services like Warmbox at $15-50/month per inbox)
Microsoft infrastructure only (no Google Workspace option)
US-based IPs only
The Ultimate Cold Email Infrastructure Guide for 2025 on our channel walks through the complete setup process and explains how dedicated IPs protect your campaigns.
2. Mailforge
Best for: Quick setup on shared infrastructure when budget is the primary constraint.
Mailforge is a distributed email infrastructure tool that uses a shared IP pool, distributing your mailbox accounts among millions of businesses. Costs start at approximately $3.00 per mailbox per month, dropping to $1.67 at bulk volumes with domains at $70/year for .com extensions.
Key features:
Automatic SPF, DKIM, DMARC setup
AI warmup and IP rotation
Fast domain and mailbox creation
Pros:
Lower entry cost for very small operations
Some warmup features included
Good UI for beginners
Cons:
Shared IP pool creates bad neighbor risk
Per-inbox pricing adds up at scale (100 inboxes = $167-300/month)
No reputation isolation
Mailforge works for agencies just starting out, but the shared infrastructure model creates the same vulnerability as Maildoso once you scale past 30-50 inboxes. The Mailreef vs Mailscale vs Inframail comparison video explains these infrastructure differences visually.
3. Google Workspace
Best for: Low-volume sending where budget is not a concern and native trust matters more than cost.
Google Workspace Business Starter costs $7.00 per user/month with annual commitment or $8.40/month for monthly subscriptions.
Key features:
Highest initial trust with ISPs
Native Gmail integration
Enterprise-grade infrastructure
Pros:
Best deliverability baseline out of the box
Familiar interface for most users
Cons:
Expensive at scale. 100 inboxes = $700-840/month
High ban risk for cold outreach (Gmail is not designed for bulk sending)
Strict sending limits (2,000/day per account)
Google Workspace makes sense for transactional email or low-volume outreach. For agencies running 50+ cold email domains, the cost becomes prohibitive. The Cold Email Insiders video on Google mailboxes explains why agencies are moving away from Workspace for cold outreach specifically.
4. Mailreef
Best for: Technical teams needing API access, dedicated servers, and maximum control.
Mailreef charges $249/month per server, which supports 200 mailboxes. Each server includes a dedicated IP address not shared with other customers, plus $0.001 per email sent and domains at $19/year.
Key features:
Dedicated IP per server
API-driven automation
Zapier integration
Pros:
True dedicated infrastructure with full control
Good for technical teams with custom requirements
Cons:
Higher price point ($249/month minimum)
Requires application approval (they screen every customer)
No inbox warmup included
Mailreef targets technical teams who want server-level control. For most agencies, the approval process and higher base cost create friction without adding proportional value.
5. Mailscale
Best for: Smaller agencies with lower volume who want a middle-ground option.
Mailscale offers tiered pricing: Solopreneur Plan at $79/month, Business Plan at $119/month, and Enterprise Plan at $249/month. You can create up to 5 inboxes per domain.
Key features:
Tiered pricing with preset inbox limits
Domain costs around $9-13/year
Built-in domain purchasing
Pros:
Good middle-ground for starting agencies
Lower entry point than Mailreef
Cons:
Forced to buy domains inside Mailscale at potentially higher prices
Shared IP infrastructure
Costs jump significantly at higher tiers
Shows limits as you scale past basic volume needs
Mailscale works for agencies with under 50 inboxes, but the tiered structure and forced domain purchasing create friction as you scale. The B2B SaaS Companies Email Infrastructure Setup video discusses when to graduate from tiered plans.
Comparison matrix: Price, IPs, and setup speed
This table summarizes the five alternatives across the criteria that matter most for agency decision-making:
Provider | Price (50 inboxes) | Price (200 inboxes) | IP Type | Setup Method | Platform Base |
|---|---|---|---|---|---|
Inframail | $129/month | $327/month | Dedicated (1-3) | Automated DNS | Microsoft |
Maildoso | $137/month | $400/month | Shared | Platform-guided | Custom |
Google Workspace | $350-420/month | $1,400-1,680/month | N/A (native) | Manual | |
Mailreef | $249/month | $249/month | Dedicated per server | API-driven | Custom |
Mailscale | $79-119/month | $249/month | Shared | Platform-guided | Custom |
The flat-rate advantage becomes obvious at scale. While per-inbox providers charge progressively more as you add mailboxes, Inframail's Unlimited Plan stays at $129/month (or $327/month for the Agency Pack) whether you run 50 or 200 inboxes.
The InfraMail Setup Tutorial by Shivam Gupta demonstrates the actual setup workflow timing if you want to see the automation in action.
"Inframail has been absolute gold in terms of delivering a great customer experience, and allowing me to spin up cold email infrastructure at scale for my clients as easily and fast as possible." - Verified user review of Inframail
Decision framework: Choosing the right infrastructure
Picking the right Maildoso alternative is not just about finding the lowest per-inbox price. It is about calculating your true total cost of ownership and understanding how infrastructure choices compound over time.
Calculate your true cost per client
Your actual infrastructure cost includes four components:
Platform fee: Monthly subscription to the infrastructure provider
Domain costs: $5-16 per domain per year, amortized monthly
Warmup tools: $15-50/month per inbox if external warmup required
Sending platform: Instantly, Smartlead, or equivalent ($37-77/month)
For an agency running 100 inboxes across 20 domains:
Maildoso TCO:
Component | Monthly Cost |
|---|---|
Platform (100 inboxes) | $200 |
Domains | Included |
Warmup (external) | $500-1,500 |
Sending platform | $77 |
Total | $777-1,777 |
Inframail TCO (Unlimited Plan):
Component | Monthly Cost |
|---|---|
Platform (unlimited) | $129 |
Domains (~$17/year × 20) | $28 |
Warmup (external) | $500-1,500 |
Sending platform | $77 |
Total | $734-1,734 |
Warmup costs assume $5-15/inbox for external tools like Warmbox or Lemwarm. Actual costs vary by provider and volume discounts.
![Total cost of ownership breakdown by provider for 100 inboxes][image_tco_breakdown_chart]
The gap between providers is similar when warmup costs are included. The key difference is that Inframail's flat-rate model means your platform cost stays at $129 whether you scale to 200 or 300 inboxes. Per-inbox models mean your costs scale with every inbox you add.
The Inframail help article on calculating email sending capacity walks through this math in more detail.
"I liked the price compared to other platforms." - Verified user review of Inframail
Test setup speed and automation
The hidden cost most agencies ignore is operational time. Manual DNS configuration requires logging into panels, creating SPF/DKIM/DMARC records, waiting for propagation, and testing deliverability. That time adds up quickly when managing 50+ domains.
Ask yourself: Can you set up 10 domains in under 10 minutes?
With automated platforms like Inframail, the answer is yes. The How to send 1000+ Cold Emails Per Day video shows the complete workflow from domain purchase to Instantly import.
The guide on SPF, DKIM, and DMARC setup demonstrates the automated setup process for authentication records that would otherwise require manual DNS panel work.
Setup automation is not a luxury feature. It is the difference between launching client campaigns same-week versus a multi-day delay while you configure DNS records and wait for propagation.
"One of the best mailbox infra vendors I have ever used super easy and quick setup and support is practically 24/7 with at max a 2min wait to get a question answered." - Verified user review of Inframail
For agencies running 50+ domains, the cost math and reputation control advantages of dedicated IPs are undeniable.
Sign up for Inframail and get started today. For 50+ inboxes, you will save $200-300/month compared to Google Workspace while getting dedicated IPs that protect your sending reputation.
Frequently asked questions
What is the exact cost difference between Maildoso and Inframail for 100 inboxes?
Maildoso costs approximately $200/month for 100 inboxes on shared IPs. Inframail costs $129/month flat for unlimited inboxes on dedicated IPs.
Does Maildoso offer dedicated IP plans?
No. Maildoso uses shared IP pools with IP rotation and does not offer dedicated IP infrastructure options.
How long does Inframail setup take compared to manual DNS configuration?
Users report setting up 10 inboxes in approximately 10 minutes with automated DNS. Manual configuration takes significantly longer due to DNS propagation wait times.
Do I need a separate warmup tool with Inframail?
Yes, you need an external warmup tool like Warmbox at $15-50/month per inbox. Our warmup guide explains the setup process.
What sending platforms work with Inframail?
Inframail exports IMAP/SMTP credentials via CSV that import directly into Instantly, Smartlead, and most cold email platforms. The platform compatibility guide lists all supported integrations.
What is the deliverability difference between shared and dedicated IPs?
Shared IPs pool your reputation with other senders, so others' behavior affects your inbox rates. Dedicated IPs isolate your reputation completely.
Key terms glossary
SPF (Sender Policy Framework): An email authentication protocol that specifies which IP addresses can send email on behalf of your domain. Per Cloudflare's authentication guide, SPF checks where the email came from.
DKIM (DomainKeys Identified Mail): A digital signature using cryptography to verify emails came from your domain and were not altered. DKIM checks message integrity.
DMARC (Domain-based Message Authentication, Reporting & Conformance): A policy that tells receiving servers what to do when SPF or DKIM checks fail. Per Microsoft's documentation, DMARC checks sender identity and provides reporting.
Dedicated IP: A unique IP address used only by you for sending email, where your behavior alone determines reputation.
Shared IP: An IP address used by multiple senders simultaneously, where everyone's sending behavior affects collective reputation.
TCO (Total Cost of Ownership): The complete infrastructure cost including platform fees, domains, warmup tools, and sending platforms.
