Maildoso has earned its place as one of the most popular cold email infrastructure providers. The onboarding is fast, the pricing is accessible, and built-in domain registration removes a step from the setup process.
But there is a structural problem with how Maildoso handles IP reputation. And for teams scaling beyond their first few hundred inboxes, that problem becomes the single biggest threat to deliverability.
Maildoso routes email through shared IP pools. Every sender on the pool shares the same IP addresses. When one sender triggers spam complaints, bounces, or blacklists, the consequences spread to everyone else on that IP. Your sending reputation is only as clean as the worst sender in your pool.
This is the core reason teams migrate from Maildoso to MailDeck.
MailDeck eliminates shared IP risk entirely across all three infrastructure types. Outlook inboxes send through official Microsoft IP pools. Google Workspace inboxes send through official Google IP pools. SMTP inboxes use dedicated IPs assigned per client. No other customer's behavior can affect your deliverability on any MailDeck product.
MailDeck provides cold email infrastructure across Microsoft 365 Outlook, Google Workspace, and SMTP, managing 833K+ inboxes for 1,631+ clients. Clients send 3-5 cold emails per inbox per day (Normal) or 8-10 per day (Premium) across domains with a minimum interval of 61 minutes between sends. Based on Q2 2026 MailDeck platform data.
Maildoso pricing verified on getmaildoso.com and third-party reviews as of May 2026. MailDeck pricing from maildeck.co.
The Shared IP Problem, Explained
Every email you send carries the reputation of the IP address it came from. Receiving servers check that IP against blacklists, spam databases, and historical sending patterns before deciding whether your message reaches the inbox or lands in junk.
With shared IP pools, you inherit the behavior of every other sender on your IP. One aggressive sender who blasts unverified lists or ignores bounce thresholds can trigger a blacklisting event that degrades deliverability for the entire pool.
This is how domains burn overnight through no fault of your own.
Maildoso monitors its pools and rotates flagged IPs automatically. That helps in some cases. But by the time a rotation happens, the damage to your active campaigns is already done. You have no visibility into who else is on your IP, what they are sending, or how they manage their lists.
Maildoso does offer dedicated IPs as a $99/month add-on. At that price, the effective per-inbox cost rises well above the base plan rate.
For a deeper analysis of how shared and dedicated IP architectures affect deliverability at scale, see our shared IP vs dedicated IP comparison.
How MailDeck Solves This
MailDeck uses three distinct IP architectures. None of them involve shared pools.
Microsoft 365 Outlook inboxes send through official Microsoft Azure IP pools. These are the same IPs used by Fortune 500 companies for corporate email. Every major receiving server whitelists Microsoft's IP ranges by default. Each MailDeck tenant is isolated from other clients.
Google Workspace inboxes send through official Google IP pools. Google's sending infrastructure carries the highest trust score of any email provider globally. Billions of legitimate emails flow through these IPs daily, and receiving servers treat Google-origin messages with inherent trust.
Private SMTP inboxes use dedicated IPs assigned to each client individually. Your reputation depends solely on your own sending behavior. No other sender can touch your IP.
The result: zero shared IP risk on any MailDeck product, at any scale, with no add-on fees required.
Pricing: Like-for-Like and Beyond
Google Workspace vs Google Workspace
Both MailDeck and Maildoso offer Google Workspace inboxes. This is the most direct comparison available.
MailDeck Google Workspace pricing:
- Start Up: $39/month for 10 inboxes ($3.90/inbox)
- Growth: $99/month for 30 inboxes ($3.30/inbox)
- Enterprise: $299/month for 100 inboxes ($2.99/inbox)
Maildoso Google Workspace pricing: approximately $1.90-2.25/inbox depending on volume. Source: getmaildoso.com.
On a pure Google-to-Google comparison, Maildoso's per-inbox rate is lower. At the Enterprise tier, MailDeck's $2.99/inbox comes closer but remains higher than Maildoso's rate.
The critical difference is the IP model. Both products use official Google IP pools, so the shared IP risk that plagues Maildoso's SMTP product does not apply to their Google Workspace offering. If you are comparing Google Workspace specifically, the decision comes down to pricing, support, and infrastructure management preferences.
Where MailDeck Changes the Math: Outlook and SMTP
Maildoso does not offer Microsoft 365 Outlook inboxes. MailDeck does, and this is where the economics shift dramatically.
MailDeck Outlook pricing:
- Normal: $30/tenant (100 inboxes) = $0.30/inbox, 3-5 cold sends/day
- Mixed: $35/tenant (100 inboxes) = $0.35/inbox
- Premium: $40/tenant (100 inboxes) = $0.40/inbox, 8-10 cold sends/day
- Pre-Warmed: $30/tenant (100 inboxes) = $0.30/inbox, ready immediately
At $0.30/inbox, MailDeck Outlook Normal is the lowest published price for a cold email inbox from any provider in the market. Maildoso has no equivalent product.
MailDeck SMTP pricing:
- 1-1,000 inboxes: $0.50/inbox
- 1,001-5,000 inboxes: $0.45/inbox
- 5,001+ inboxes: $0.40/inbox
Every MailDeck SMTP inbox comes with a dedicated IP included in the base price. Maildoso's shared IP SMTP charges $99/month extra for a dedicated IP add-on.
Scaling Comparison
At 100 inboxes:
- MailDeck Outlook Normal: 1 tenant, $30/month ($0.30/inbox)
- MailDeck SMTP: $50/month ($0.50/inbox)
- Maildoso: approximately $190-225/month ($1.90-2.25/inbox)
At 500 inboxes:
- MailDeck Outlook Normal: 5 tenants, $150/month ($0.30/inbox)
- MailDeck SMTP: $250/month ($0.50/inbox)
- Maildoso: approximately $950-1,125/month ($1.90-2.25/inbox)
At 1,000 inboxes:
- MailDeck Outlook Normal: 10 tenants, $300/month ($0.30/inbox)
- MailDeck SMTP: $500/month ($0.50/inbox)
- Maildoso: custom quote required at this scale
At 500 inboxes, the savings on MailDeck Outlook Normal versus Maildoso reach $800-975/month. Annually, that compounds to $9,600-11,700 in infrastructure cost savings. For a broader comparison of infrastructure costs across the market, see our cost analysis of cold email infrastructure in 2026.
Minimum Spend
MailDeck minimums:
- Outlook: 2 tenants (200 inboxes), $60/month
- SMTP: 100 inboxes, $50/month
- Google Workspace: 10 inboxes, $39/month
Maildoso minimum: approximately $50/month at the entry tier.
MailDeck's Google Workspace Start Up plan at $39/month is the lowest entry point across both providers.
Diversified Stack: The Infrastructure Advantage Maildoso Cannot Match
Most cold email teams eventually learn that running a single infrastructure type creates unnecessary risk. If your only provider has an outage, a policy change, or a deliverability dip, your entire pipeline stops.
MailDeck offers Diversified Stack plans that combine all three infrastructure types under one provider:
- Starter: $99/month (2 Outlook Premium tenants + 10 SMTP + 5 Google)
- Growth: $399/month (10 Outlook Premium tenants + 100 SMTP + 30 Google)
- Enterprise: $3,499/month (100 Outlook Premium tenants + 1,000 SMTP + 300 Google)
Maildoso offers Google Workspace and SMTP. It does not offer Microsoft 365 Outlook. Teams that want all three infrastructure types under one provider have MailDeck as the only option that covers the full stack.
For the strategy behind running multiple infrastructure types simultaneously, see our infrastructure diversification guide.
Where MailDeck Falls Short
Setup speed on SMTP and Outlook. Maildoso provisions mailboxes in minutes. MailDeck's SMTP takes 24 hours, and Outlook takes 2-3 business days. MailDeck's Google Workspace product is instant, but if you specifically need SMTP or Outlook inboxes running today, Maildoso delivers faster.
Lower per-inbox cost on Google Workspace. On a direct Google-to-Google comparison, Maildoso's approximately $1.90-2.25/inbox undercuts MailDeck's $2.99-3.90/inbox. For teams that exclusively want Google Workspace inboxes and prioritize cost over multi-provider coverage, Maildoso is cheaper per inbox.
Included domains on some plans. Maildoso bundles domain registration into certain plans. MailDeck does not include domain registration. For teams without existing domains, Maildoso reduces the initial procurement step.
Seven Reasons Teams Switch to MailDeck
1. Zero Shared IP Risk
This is the migration trigger. Every MailDeck product eliminates shared IP exposure entirely. Outlook uses official Microsoft IP pools. Google uses official Google IP pools. SMTP uses dedicated IPs per client. Your deliverability depends on your own behavior and nothing else.
On Maildoso's shared pools, a single bad sender can trigger blacklisting that impacts every user sharing that IP address. Getting a dedicated IP on Maildoso costs $99/month extra. On MailDeck, IP isolation is built into every product at the base price.
2. Three Infrastructure Types Under One Provider
MailDeck provides Microsoft 365 Outlook, Google Workspace, and Private SMTP. All three are equally supported. Maildoso offers Google Workspace and SMTP. MailDeck adds the entire Microsoft 365 ecosystem, which matters when your prospects sit behind Microsoft Exchange servers. Corporate mail servers that handle Outlook traffic treat Microsoft-origin messages with the highest possible trust.
3. Lower Cost Per Inbox at Scale
MailDeck Outlook Normal delivers 100 inboxes per tenant at $0.30/inbox. That is the lowest published price for a cold email inbox from any major provider. At 1,000 inboxes, MailDeck Outlook Normal costs $300/month total.
Even comparing SMTP to SMTP directly, MailDeck at $0.40-0.50/inbox undercuts Maildoso's $1.90-2.25/inbox by approximately 75-85%.
4. 100 Inboxes Per Outlook Domain
Each MailDeck Outlook tenant includes 100 inboxes on a single domain. Maildoso provisions approximately 4-5 mailboxes per domain. To reach 100 inboxes on Maildoso, you would need 20-25 domains. On MailDeck Outlook, you need one. This simplifies domain management, reduces DNS configuration overhead, and concentrates domain reputation instead of fragmenting it.
5. Official Provider IP Trust
Microsoft and Google IP ranges are whitelisted by default on virtually every corporate mail server worldwide. This trust is inherent to the infrastructure. It does not require warmup strategies, IP reputation building, or rotation. Maildoso's shared SMTP IPs carry whatever aggregate reputation the pool has accumulated, and that reputation changes daily based on every sender in the pool.
6. Transparent Pricing at Every Scale
MailDeck pricing is published and linear. 10 Outlook Normal tenants (1,000 inboxes) cost $300/month. 100 tenants (10,000 inboxes) cost $3,000/month. 5,000 SMTP inboxes cost $2,250/month. No custom quotes, no volume negotiations, no hidden tiers. Teams can model their infrastructure costs before committing to a single inbox.
7. Platform Data Advantage
MailDeck manages 833K+ inboxes across 1,631+ clients, with 7.5M+ emails sent per day and 270M+ lifetime cold emails across 3,000+ domains. This dataset drives optimization decisions across DNS configuration, warmup protocols, and deliverability monitoring. The platform maintains 98% inbox placement based on Q2 2026 data.
Full Product Comparison
Infrastructure types:
- MailDeck: Microsoft 365 Outlook + Google Workspace + SMTP
- Maildoso: Google Workspace + shared SMTP
IP model:
- MailDeck: Official Microsoft/Google pools + dedicated SMTP IPs
- Maildoso: Shared IP pools with rotation
Cost per inbox (Outlook):
- MailDeck: From $0.30
- Maildoso: No Outlook product available
Cost per inbox (SMTP):
- MailDeck: $0.40-0.50
- Maildoso: ~$1.90-2.25
Cost per inbox (Google):
- MailDeck: $2.99-3.90
- Maildoso: ~$1.90-2.25
Dedicated IP:
- MailDeck: Included on all products
- Maildoso: $99/month add-on
Inboxes per domain (Outlook):
- MailDeck: 100
- Maildoso: N/A
Setup time:
- MailDeck: Instant (Google), 24h (SMTP), 2-3 days (Outlook)
- Maildoso: Minutes
Minimum spend:
- MailDeck: $39/month (Google 10 inboxes)
- Maildoso: ~$50/month
DNS setup:
- MailDeck: Automated SPF, DKIM, DMARC with propagation verification
- Maildoso: Automated SPF, DKIM, DMARC
Inbox placement:
- MailDeck: 98% (Q2 2026 platform data)
- Maildoso: Not published
Managed inboxes:
- MailDeck: 833K+
- Maildoso: Not published
FAQ
How much does Maildoso cost per inbox?
Maildoso pricing is approximately $1.90-2.25 per inbox depending on volume and billing cycle. Google Workspace inboxes are also available. Dedicated IPs are a $99/month add-on. Source: getmaildoso.com pricing page, verified May 2026.
Does Maildoso use shared or dedicated IPs?
Maildoso uses shared IP pools by default on all base plans. Every sender on the pool shares the same IP addresses. Dedicated IPs are available as an add-on for $99/month. MailDeck uses official Microsoft IP pools (Outlook), official Google IP pools (Google Workspace), and dedicated IPs (SMTP) with zero shared IP risk on any product.
How does MailDeck compare to Maildoso on pricing?
MailDeck Outlook Normal starts at $0.30/inbox (100 inboxes per tenant, $30/month). SMTP starts at $0.50/inbox. Google Workspace starts at $2.99/inbox. At 1,000 Outlook inboxes, MailDeck costs $300/month. At 1,000 SMTP inboxes, $500/month. Maildoso's pricing at $1.90-2.25/inbox makes their Google Workspace cheaper per inbox, but MailDeck's Outlook and SMTP products have no Maildoso equivalent.
What is the risk of shared IP pools in cold email?
Shared IP pools mean multiple senders use the same IP addresses. If any sender triggers spam complaints, high bounce rates, or blacklisting, every other sender on that IP is affected. Third-party reviews on G2 and community forums document instances of domains being burned overnight due to pool-wide issues. MailDeck avoids this: Outlook and Google use official provider IPs, and SMTP uses dedicated IPs per client.
Can I use MailDeck with Instantly or Smartlead?
Yes. All MailDeck inboxes connect via SMTP to any sequencer: Instantly, Smartlead, Saleshandy, Apollo, Lemlist, Woodpecker, Reply.io, Snov.io, QuickMail, GMass, and any SMTP-compatible tool. MailDeck provides infrastructure only.
What infrastructure types does MailDeck offer?
Three types: Microsoft 365 Outlook (from $0.30/inbox, 100 inboxes per tenant, 2-3 day setup), Google Workspace (from $2.99/inbox, instant setup), and Private SMTP (from $0.40/inbox, dedicated IPs, 24-hour setup). Most competitors specialize in one or two. MailDeck covers all three.
How long does MailDeck setup take compared to Maildoso?
Maildoso provisions mailboxes in minutes. MailDeck setup varies: Google Workspace is instant, SMTP takes 24 hours, Outlook takes 2-3 business days. MailDeck includes full DNS propagation verification and SPF/DKIM/DMARC authentication before the first email sends.
Methodology
This comparison uses Maildoso pricing from getmaildoso.com and third-party reviews published as of May 2026. MailDeck data comes from internal platform metrics (Q2 2026) covering 833K+ managed inboxes across 1,631+ clients. Infrastructure claims about shared vs dedicated IPs are verified through published third-party reviews and official product documentation from both providers. MailDeck pricing is from maildeck.co. All cost-per-inbox calculations use the lowest available tier at each scale point.
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