Getting inboxes from Puzzle Inbox feels easy until you try to scale.
You start sending, but then:
Google inboxes work, MS365 becomes inconsistent reply rates drop as volume increases you don’t control reputation or IPs I’ve faced this.
I used pre-warmed inboxes to launch fast.
The first few days worked.
But once volume increased, deliverability became unpredictable, especially outside Google.
Even some of its users say:
“Good for quick setup, but not ideal long term” “MS inboxes are another story” “Pre-warmed inboxes can be hit or miss” At that point, exploring Puzzle Inbox alternatives starts to make sense.
In this guide, you’ll find tools based on what actually matters:
Google vs MS365 performance pre-warmed vs owned inboxes cost vs control So you can pick what actually works at scale.
Puzzle Inbox Alternatives for Google/MS365 Mailboxes: Top 5 Picks Primeforge - Best for ready-to-use Google & MS365 inboxesMaildoso - Ideal for pre-warmed inbox scaleInframail - Best for Microsoft-heavy outboundInfraforge - Great for full infrastructure controlMailforge - Best for flexible SMTP-based setupWhy Users Look for Puzzle Inbox Alternatives? Puzzle Inbox works well when you want to start fast.
But once you try to scale, some limitations start to show.
Here’s what users typically experience:
It’s good for quick setup, but not ideal for long-term use. Many users find that things work in the beginning, but performance drops as they increase volume. Google inboxes tend to perform better, but MS365 becomes inconsistent. Campaigns that work on Google often don’t give the same results on Outlook. Pre-warmed inboxes don’t always guarantee good deliverability. Since the warmup is not based on your use case, results can feel hit or miss. You don’t have full control over reputation or infrastructure. If something goes wrong, you can’t easily fix or troubleshoot it. There are mixed experiences around reliability. Some users are satisfied, while others are unsure about long-term stability. Because of this, many users start exploring alternatives that offer better control, more consistent deliverability, and a setup that actually scales.
How I Evaluated Puzzle Inbox Alternatives? I focused on what actually impacts deliverability and day-to-day outbound.
Here’s how I evaluated Puzzle Inbox alternatives:
Set up time from purchase to first campaign (how fast you can start sending) Deliverability consistency across Google and MS365 inboxes Control over infrastructure (DNS, domains, reputation) Pre-warmed vs fresh inbox setup and flexibility Ability to scale with multiple inboxes without performance drop Cost per inbox as you increase volume Ease of replacing or rotating inboxes when needed Reliability during continuous outbound campaigns These checks helped me find alternatives that are easier to scale and more consistent over time.
7 Best Puzzle Inbox Alternatives for Google/MS365 Mailboxes: Quick Comparison
Criteria
Primeforge
Maildoso
Inframail
Infraforge
Mailforge
Hypertide
Mailscale
Setup speed ~30 mins
~10 mins
Minutes
~5 mins
~5 mins
4–6 hrs
~20–30 mins
Infra control Medium
Low (own ESP + IP rotation)
Medium
High (dedicated IPs)
Medium
High (isolated tenant)
Medium
Pre-warmed Yes
Add-on
No
No
Not mentioned
No
Not mentioned
Scaling model Per mailbox
Per mailbox
Unlimited
Unlimited
Flexible slots
Fixed per order
Bulk creation
Pricing model Per mailbox
Per mailbox
Flat plan
Per mailbox
Per mailbox
Per order
Subscription
1. Primeforge This image shows the Primeforge homepage Primeforge is a cold email infrastructure tool that gives you Google Workspace and Microsoft 365 mailboxes built for outreach.
With Puzzle Inbox, things feel simple and quick to start.
It leans more toward done-for-you inbox setup.
With Primeforge, it feels more like setting up structured infrastructure for outreach.
You get Google Workspace and MS365 mailboxes configured for cold email use cases.
Setup is also faster.
I could get mailboxes ready in about 30 minutes, while Puzzle Inbox usually takes 24-72 hours.
If you just want something quick and hands-off, Puzzle Inbox works.
If you want a faster setup and a setup designed around deliverability and scaling, Primeforge is positioned more in that direction.
Key Features of Primeforge Provides Google Workspace and Microsoft 365 mailboxes for cold outreach Includes pre-warmed inboxes so you can start sending faster Handles SPF, DKIM, and DMARC setup automatically Uses US-based IP addresses Supports bulk DNS updates for multiple domains Allows multiple workspaces for managing teams Includes profile pictures and GIF support for mailboxes Primeforge vs Puzzle Inbox: Quick Comparison
Feature
Primeforge
Puzzle Inbox
Setup time ~30 minutes
24–72 hours
Mailbox type Google Workspace & MS365 mailboxes
Google Workspace & Outlook 365 inboxes
Pre-warmed inboxes Yes
Yes
DNS setup Automated
Done-for-you
SPF / DKIM / DMARC Included
Included
IP setup US-based IPs
Not specified in available data
Ownership Full domain & mailbox ownership
Not clearly specified
Pros & Cons of Primeforge
Pros
Cons
Uses real Google Workspace & Microsoft 365 mailboxes built for cold outreach
Fast setup (~30 minutes)
Automated DNS setup (SPF, DKIM, DMARC)
US-based IP addresses for a better deliverability baseline
Full domain and mailbox ownership
No free trial available
Requires purchasing domains and mailboxes to use
Built specifically for cold outreach (not for daily email use)
No explicit mention of advanced customization controls
No explicit mention of detailed reporting/analytics
Primeforge Pricing This image shows the Primeforge pricing $4.5 to $3.5 per mailbox per month Annual billing gives 2 months free Domains around $14 per year (.com example) Minimum 10 mailbox slots
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2. Maildoso This image shows the Maildoso homepage Maildoso is a cold email infrastructure tool built for outbound.
Compared to Puzzle Inbox, Maildoso is positioned around low-cost mailbox creation and fast bulk setup.
You can create domains and mailboxes in the dashboard and have them ready to export in about 10 minutes.
Another difference I noticed is how sending works.
Puzzle Inbox connects inboxes through SMTP/IMAP and gives pre-warmed options.
Maildoso runs on its own servers, acts as its own ESP, and includes IP rotation.
Key Features of Maildoso Provides mailboxes and domains built for outbound SPF, DKIM, DMARC, and MX records are auto-configured Mailboxes can be ready in about 10 minutes Automatic IP rotation is included Domain forwarding is set up by default Master inbox helps manage replies in one place Reputation checks and inbox placement checks are available on some plans Maildoso vs PuzzleInbox: Quick Comparison
Feature
Maildoso
Puzzle Inbox
Setup speed ~10 minutes bulk setup
24–72 hours delivery
Infrastructure model Own ESP + IP rotation
SMTP/IMAP-based inboxes
Mailbox creation Bulk creation in dashboard
Done-for-you setup
Domains Free with plans
Purchased/managed for you
Warmup Paid AI warmup add-on
Pre-warmed inboxes (on plans)
Pros & Cons of Maildoso
Pros
Cons
Setup is very fast and positioned around 10 minutes
Domains are included for free with mailbox plans
SPF, DKIM, DMARC, and MX records are auto-configured
Uses automatic IP rotation
Offers bulk setup for large mailbox volumes
There is a hard sending limit per email account
Premium AI Warmup costs extra
Built for B2B cold email only
Does not support custom DNS records beyond CNAME
Some domain actions are handled via support
Maildoso Pricing This image shows the Maildoso pricing Maildoso offers flexible SMTP and Google Workspace mailbox pricing designed for scaling teams and agencies.
I. Combo: SMTP + Google Workspace (Monthly)
10 GW + 10 SMTP - $50/month, ($2.5 per mailbox), 4 domains required (not included) 25 GW + 25 SMTP - $113/month, ($2.25 per SMTP, $2.5 per GW), 10 domains required (not included) 100 GW + 100 SMTP - $380/month, ($1.9 per SMTP, $2.5 per GW) · 40 domains required (not included) II. Quarterly SMTP Plans
32 mailboxes - $299/quarter, ($3.1 per mailbox), 8 domains included 68 mailboxes - $499/quarter, ($2.4 per mailbox), 17 domains included 400 mailboxes - $2,199/quarter, ($1.8 per mailbox), 100 domains included All plans scale with volume, offering lower per-mailbox costs on larger packages.
3. Inframail This image shows the Inframail homepage Inframail is a cold email infrastructure tool that lets you create and host unlimited email inboxes on a flat monthly plan.
Puzzle Inbox is more done-for-you.
You get ready inboxes in 24–72 hours.
With Inframail, I had more control.
I could create inboxes in minutes and scale without paying per inbox.
The pricing model is also different.
Puzzle Inbox charges per inbox.
Inframail gives unlimited inboxes, but you need to buy domains separately.
Another key difference is how you use it.
Puzzle Inbox handles most of the setup.
Inframail only gives you the infrastructure.
You still need:
domains sending tools like Instantly or Smartlead proper warmup If you want something simple, Puzzle Inbox is easier.
If you want more control and lower cost at scale, Inframail makes more sense.
Key Features of Inframail Unlimited inboxes are included under its plans. Dedicated US IPs are included depending on the plan. Automatic SPF, DKIM, and DMARC setup is included. Domains can be bought directly from the platform. Inboxes can be created in minutes. Real-time deliverability monitoring is included. Custom tracking domains are supported. Inframail vs PuzzleInbox: Quick Comparison
Feature
Inframail
Puzzle Inbox
Core model Flat-plan inbox infrastructure
Per-inbox done-for-you setup
Setup speed Minutes / very fast setup
24–72 hours
Inbox pricing model Unlimited inboxes under a plan
Charged per inbox
Domains included No
Domain purchasing handled for you
DNS setup Automatic SPF, DKIM, DMARC setup
DNS, SPF, DKIM, DMARC handled for you
Bulk scaling Unlimited inbox hosting
Unlimited inbox ordering from dashboard
Pros & Cons of Inframail
Pros
Cons
Unlimited inboxes are included under the plan
Setup is very fast and positioned around minutes
Dedicated IPs are included
SPF, DKIM, and DMARC setup is automated
Real-time deliverability monitoring is included
Domains are not included
Warmup is still required for at least 2 weeks
It is not a sending tool by itself
You still need tools like Instantly, Smartlead, or Reachinbox
Domain transfers cost $5 per domain
Inframail Pricing This image shows the Inframail pricing Unlimited Plan: $99/month + taxAgency Pack: $249/month + tax (includes 3 dedicated US IPs)DFY Setup + Consulting: $299/month + tax + $1,497 one-time setupDomains are not included and must be purchased separately. Inbox creation is included in the plan with no extra cost per inbox. You can cancel anytime. 4. Infraforge This image shows the Infraforge homepage Infraforge is a private email infrastructure tool built for cold outreach.
What felt different to me is how quickly you can spin things up without waiting on anyone.
You add a domain, and the system handles SPF, DKIM, and DMARC in the background.
You’re ready in a few minutes.
It also runs on dedicated IPs.
That means your setup is isolated.
No shared reputation issues.
Another thing is how it handles scale.
You are not thinking in terms of “inboxes per plan.”
You can keep adding domains and mailboxes as needed.
You still need a sending tool to actually run campaigns.
Infraforge is only the infrastructure layer.
Key Features of Infraforge DNS setup (SPF, DKIM, DMARC) is handled automatically Dedicated IPs are included, with option to add more You can create unlimited mailboxes and domains Bulk DNS updates help manage large setups quickly Domain transferring is supported Works with Salesforge and other sending tools SSL and domain masking are available for added control Infraforge vs PuzzleInbox: Quick Comparison
Pros and Cons of Infraforge
Infraforge Pricing This image shows the Infraforge pricing Infraforge uses per-mailbox pricing that scales with volume.
Pricing ranges from $4 to $3 per mailbox per month, depending on billing cycle. Annual billing gives 2 months free on mailbox pricing. Domains are priced separately (for example, .com domains around $14 per year, charged once). Your subscription includes automated DNS setup, inbox hosting, maintenance, API access, and support. Add-ons include:Dedicated IPs – $99 per IP per month SSL & Domain Masking – $2 per domain per month (quarterly) Masterbox – $7 per workspace per month (annual billing) 5. Mailforge This image shows the Mailforge homepage Mailforge is a cold email infrastructure tool positioned as a simpler alternative to Puzzle Inbox.
You set up domains and mailboxes yourself and get started in minutes.
What I noticed is the control vs convenience trade-off.
Mailforge gives you a guided setup.
It helps you figure out how many domains and mailboxes you need, and handles DNS (SPF, DKIM, DMARC) automatically.
Puzzle Inbox, on the other hand, is more done-for-you.
Everything comes pre-configured and sometimes pre-warmed.
Another key difference is infrastructure type.
Mailforge runs on shared IPs, similar to Google or Outlook-style environments, but built for cold outreach.
So you are not managing everything like private infrastructure, but you are also not waiting on delivery like Puzzle Inbox.
If your goal is to start fast and keep costs low, Mailforge feels more flexible.
Key Features of Mailforge Domains and mailboxes can be set up in minutes (~5 mins) Shared IP infrastructure designed for cold outreach Bulk DNS updates for managing multiple domains Domain transferring is supported Multiple workspaces available Works with Salesforge and other sending tools SSL and domain masking available as add-ons Inbox hosting and maintenance included in subscription Mailforge vs PuzzleInbox: Quick Comparison
Feature
Mailforge
Puzzle Inbox
Setup speed ~5 minutes
24–72 hours
Infrastructure type Shared IP infrastructure
Pre-configured inbox setup
DNS setup Automated
Done-for-you
Warmup Not clearly specified
Pre-warmed inboxes available (on warmed plan)
Mailbox scaling Flexible (based on slots)
3 inboxes per domain
Sending tool Requires external tool
Connect via SMTP/IMAP
Pros and Cons of Mailforge
Pros
Cons
Very fast setup (~5 minutes)
Automated DNS setup
Lower cost compared to traditional inbox providers
Works with Salesforge and other tools
Supports domain transfer and multiple workspaces
Uses shared IP infrastructure
No free trial mentioned
Domains are billed separately
Requires separate sending tool
Warmup is not clearly included in base setup
Mailforge Pricing This image shows the Mailforge pricing Mailboxes start at $3 per mailbox/month Can go down to $2 per mailbox/month (volume-based) What’s included:
Automated DNS setup (SPF, DKIM, DMARC) Inbox hosting and maintenance Customer support Add-ons:
SSL & domain masking → $2/domain/month (monthly billing) SSL & domain masking → $6/domain/year (annual billing) 6. Hypertide This image shows the Hypertide homepage Hypertide is an automated email infrastructure tool built around Google, Microsoft, and Entra.
What stood out to me is the setup model.
Instead of buying inboxes like Puzzle Inbox, you’re creating a full environment that gets configured in a few hours.
Each order is isolated.
Your domains, IPs, and inboxes are not shared with others.
It also connects directly to tools like Smartlead, Instantly, and Bison, so once setup is done, you can start sending without extra steps.
Compared to Puzzle Inbox, this feels less “done-for-you inbox delivery” and more like a controlled system built for scale.
Key Features of Hypertide Automated setup across Google, Microsoft, and Entra (4–6 hours) Tenant separation (isolated domains, IPs, users per order) Works with Smartlead, Instantly, and Bison 100 inboxes per order (split across domains) Native Outlook-style inbox experience (for Entra) Warmup tools available for bulk updates Option to bring your own domains or buy inside platform Hypertide vs PuzzleInbox: Quick Comparison
Feature
Hypertide
Puzzle Inbox
Setup speed 4–6 hours
24–72 hours
Infrastructure type Isolated tenant setup
Pre-warmed inbox delivery
DNS setup Automated
Done-for-you
Inbox model ~100 inboxes per order
3 inboxes per domain
Sending capacity ~5,000 emails/month per order
~12 emails/day per inbox
Warmup Tools provided
Pre-warmed inboxes available
Sending tool Integrates with sequencers
Connect via SMTP/IMAP
Pros and Cons of Hypertide
Pros
Cons
Fully automated setup (no manual work)
Isolated setup improves control
Works across Google, Microsoft, Entra
Fixed pricing regardless of scale
Good for high-volume sending
No free trial
Setup is not instant (takes hours)
Requires external sending tool
Domain cost may be separate
Not beginner-friendly like done-for-you inbox tools
Hypertide Pricing This image shows the Hypertide pricing $50/month per order One-time implementation/setup fee (not fixed in data) What you get per order:
~100 inboxes (across 2 domains) Pre-configured SPF, DKIM, DMARC ~5,000 emails/month sending capacity Integration with Smartlead, Instantly, Bison Warmup tools access Additional notes:
Domains can be brought or purchased (~$15.5/domain mentioned) If Hypertide buys domains → faster setup (~24 hours) If you bring domains → setup may take longer (3–5 days) 7. Mailscale This image shows the Mailscale homepage Mailscale is a cold email inbox tool I’d use when the goal is to create a large number of inboxes quickly without spending hours on setup.
It doesn’t give you ready inboxes like Puzzle Inbox. Instead, you generate them inside the tool and export them as a CSV.
What I noticed is that it removes a lot of the repetitive setup work.
You don’t have to manually configure domains and email accounts step by step.
Once the inboxes are created, you import them into your sending tool and then start using them.
That changes how you scale.
You’re not waiting for inbox delivery.
You’re creating them when you need them.
But you still handle the final step of connecting and running them.
That makes it faster to get started, but a bit more hands-on compared to fully done-for-you setups.
Key Features of Mailscale Create 50–1000 inboxes quickly from one dashboard Works with Instantly, Smartlead, Apollo, Lemlist, Reply, Mailshake Buy domains inside platform or bring your own Automatic setup of SPF, DKIM, DMARC (for purchased domains) Uses own infrastructure + IP pools Supports up to 5 inboxes per domain Inbox swapping available via support Mailscale vs PuzzleInbox: Quick Comparison
Feature
Mailscale
Puzzle Inbox
Inbox creation Bulk create inboxes in minutes
Delivered after order (24–72h)
Setup process Self-serve (form → CSV → import)
Done-for-you setup
Domains Buy inside or bring your own
Fully handled for you
DNS setup Auto for domains bought inside
Fully managed
Inboxes per domain Up to 5
3 per domain
Delivery method CSV file with SMTP/IMAP creds
Direct connection ready
Sending tools Works with Instantly, Smartlead, Apollo, etc.
Works via SMTP/IMAP
Pros and Cons of Mailscale
Pros
Cons
Create 50–1000 inboxes very fast (seconds to minutes)
Setup takes ~5 minutes instead of manual 12+ hours
Works with any sending tool via SMTP/IMAP
Domains can be bought inside or added manually
SPF, DKIM, DMARC handled for domains set up in Mailscale
No pre-warmed inboxes mentioned
Email forwarding is not supported
DNS customization is generally not possible
Requires CSV import into sending tools
Some requests require support (manual handling)
Mailscale Pricing This image shows the Mailscale pricing Business plan: $95/month or $119/month (inconsistent across page) Includes: up to 50 inboxes Inboxes can go as low as ~$1 per inbox (volume-based claim) Domains: $10–$15/year per domain What you actually get:
50 inboxes Domain purchase inside platform CSV export for sending tools Basic setup handled (SPF, DKIM, DMARC for internal domains)
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Enter your email to get a custom plan & stack recommendation for your
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Which Puzzle Inbox Alternative Should You Choose? The right choice depends on how you want to run your outreach.
If you want everything done for you and don’t want to touch setup, Puzzle Inbox still works.
But most teams hit limits when they start scaling.
If you want more control, faster setup, or better cost at scale, the alternatives start making more sense.
Want real Google/Microsoft inboxes + faster setup → Primeforge Want low-cost bulk setup → Maildoso Want unlimited inbox scaling → Inframail Want private infra with dedicated IPs → Infraforge Want quick shared infra without complexity → Mailforge Want fixed-capacity sending setup (~5,000 emails/month) → Hypertide Want instant bulk inbox creation → Mailscale So it really comes down to this, do you want something done-for-you?
Or something you can control and scale your way?
If your goal is to move faster without losing deliverability, Primeforge is one of the most practical options.
You get real inboxes, faster setup, and a system that actually holds up when you scale.
If you’re planning to fix your outreach setup or start fresh, Primeforge is worth trying first.
