We Tested 5 Mailscale Alternatives To Generate 100 Email Accounts" Fast and Stress-Free
Creating 100 email accounts sounds simple… until you actually try doing it.
I’ve tested this firsthand.
Manual setup? Too slow.
Cheap tools? Got flagged.
One inbox got shut down before I even hit send.
That’s when I started using tools like Mailscale.
It creates and warms up email accounts — automatically — so you don’t burn your sender reputation.
And while Mailscale works well for some teams, it’s not perfect.
💥 Here’s What I Ran Into
- It got expensive once I tried scaling past 20–30 inboxes
- No control over the setup (domain, IP, warmup pace)
- Limited support when things broke
- Not ideal if you're running multiple cold outreach campaigns
If you’re running a lead gen agency, outbound sales team, or just want more control over how your emails land, you need better options.
I personally tested 5 Mailscale alternatives to create and warm 100 email accounts — safely and reliably.
You’ll learn:
- Which tool gave the cleanest setup
- Which one got the best inbox placement
- And what I’d use if I had to start from scratch today
This isn’t theory. I tested these tools across 3 domains, tracked deliverability, and spent over 2 weeks monitoring results.
Let’s break it down — tool by tool — and find out what actually works.
TL;DR – Quick Summary
- We tested 5 Mailscale alternatives for cold email warmup and scaling.
- InfraForge was the most complete — it helped us create and warm 100 inboxes across multiple domains with zero manual setup.
- Smartlead and Instantly are great if you want warmup + outreach in one tool.
- Warmforge and Mailivery work well if you already have inboxes and just need a warmup.
- For speed, scale, and no tech hassle, InfraForge is the best bet.
Why People Use MailScale (But Still Look for Alternatives)
If you’ve ever tried setting up 10, 20, or even 50 inboxes by hand, you know how quickly things get out of control.
That’s where Mailscale comes in.
👉 So, what is Mailscale?
It’s a tool that automatically creates and warms up email accounts, so your cold emails avoid spam and actually reach people.
It’s designed for cold outreach teams who want to scale without messing with manual setups or risking deliverability.
And for a lot of teams, that’s a huge time-saver.
✅ What Mailscale Does Well
- Automates email account creation
- Warms up inboxes to improve deliverability
- Supports multiple domains to spread the sending volume
- Saves hours of backend setup work
It’s a good starting point if you just need to get a few accounts running fast.
👎 But It Doesn’t Work for Everyone
When I tried to scale beyond 30–40 accounts, it started to fall short.
- It gets expensive
If you’re building for a full team, the cost per inbox adds up fast.
Read the full user review
- You don’t get much control
I couldn’t adjust warmup speed or customize the sending behavior. - Support takes time
When inboxes failed or didn’t warm properly, it wasn’t easy to get fast help. - Not built for deep workflows
If you want to automate around custom domains or track more details, it feels limited.
Read the full user review
So, Why Do People Still Use It?
Because it’s simple.
If you’re just getting started and want something that works out of the box, Mailscale does the job.
But if your goal is to generate 100+ warm inboxes, maintain full control, and optimize cold outreach, it’s probably time to look elsewhere.
That’s why I went out, tested other tools myself, and built a list of real alternatives that solve these gaps.
Next up — here’s what I looked for in a better solution.
What I Looked For in a Mailscale Alternative
Before I started testing other tools, I sat down and made a list.
If I were going to replace Mailscale — or recommend something better — the new tool had to do more than just “warm inboxes.”
It had to solve the real problems that show up when you're trying to scale cold outreach fast, across multiple domains, accounts, and campaigns.
So here’s exactly what I looked for.
1. Can It Actually Create Accounts?
This was non-negotiable.
A lot of warm-up tools expect you to create inboxes manually. But if you’re trying to set up 50 or 100 inboxes, you don’t want to waste hours doing it by hand.
✅ I wanted a tool that could create inboxes automatically — ideally across Gmail, Outlook, or custom domains.
2. Does It Warm Them Safely?
Warmup isn’t just about sending random emails.
Done wrong, it can trigger spam filters and ruin your sender score.
So I looked for tools that:
- Send realistic email patterns (not spammy scripts)
- Use real human-like inbox interactions
- Gradually increase volume over time
- Monitor bounce rates and blacklist status
I wanted a warmup that feels real, not something that gets flagged in the first week.
3. Is It Easy to Monitor?
The last thing I wanted was a tool that just “runs in the background” with no feedback.
I needed visibility into what was actually happening.
✅ A good dashboard should show:
- Inbox health
- Warmup progress
- Open rates and placement
- Errors or flags to fix quickly
If I can’t see what’s working (or what’s broken), I can’t trust the tool.
4. How Much Control Do I Have?
This was a big one.
With Mailscale, I felt boxed in. I couldn’t change the warmup speed, messaging, or scheduling.
So I looked for tools that gave me control over:
- Warmup volume and pacing
- Daily send limits
- What kind of emails are being sent
- How long does each inbox stay in warmup?
More control = fewer surprises down the road.
5. Can I Afford It at Scale?
Let’s be real — pricing matters.
Some tools look cheap on the surface, but the moment you add more inboxes, the price explodes.
I wanted pricing that actually made sense for scaling to 50, 100, or even 200 inboxes.
✅ Tools that offered:
- Flat-rate or volume-friendly pricing
- No hidden fees for adding domains
- Transparent billing
Cold outreach already costs time and effort. The tech shouldn't eat half your budget.
6. Does It Play Well With Other Tools?
I didn’t want a standalone warmup tool.
I wanted something I could connect with the rest of my cold outreach stack — like CRMs, Google Workspace, or cold email platforms.
Bonus points if it had:
- Zapier or API integrations
- CRM sync
- Outreach support (not just warmup)
The more I could automate, the better.
Here Are the 5 Mailscale Alternatives We Tested
To save you hours of research, I personally tested five of the most talked-about tools for creating and warming up cold email accounts.
Here’s the full list of tools we tested:
- InfraForge
- Warmforge
- Smartlead.ai
- Instantly.io
- Mailivery
To make it easier for you to compare, I’ve created a simple table below, so you can quickly see what each tool offers and which one might fit your setup best.
- Auto or BYO = Automatic or Bring Your Own inboxes
- Deliverability Tools = DNS setup help, spam score tracking, or warmup strength
- Inbox Rotation = Rotating multiple inboxes to spread send volume safely
InfraForge – A Smarter, Fully Automated Alternative to MailScale
InfraForge is a fully automated cold email infrastructure tool that creates, configures, and warms inboxes without any manual setup.
No DNS headaches. No manual inbox creation. No confusing dashboards.
Set up and warm 100 inboxes across multiple domains — fast, safely, and without burning time on technical setup.
What InfraForge Offers
InfraForge gives you everything you need to launch and run cold email campaigns — without doing any of the hard setup work yourself. Here’s how it helps:
It creates your email accounts for you
Just tell it how many inboxes you need — it sets them up (Gmail, Outlook, or your own domain) without you logging in anywhere.
It sets up your domain automatically
No need to mess with DNS records or email settings. InfraForge handles everything so your emails look trusted and professional.
It warms up your inboxes safely
New inboxes can’t start blasting cold emails. InfraForge sends smart, human-like emails in the background to build trust with inbox providers.
It spreads emails across multiple inboxes
Instead of using one inbox and getting flagged, it rotates your sending to keep each inbox safe and deliverability high.
It gives you one place to track everything
You can see which inboxes are healthy, if anything needs fixing, and how your warmup is going — no technical setup needed.
It scales easily if you grow
Whether you need 10 inboxes or 100, InfraForge keeps things simple. It’s built for teams, agencies, and founders who just want it to work.
Infraforge Pricing — Simple and Scales With You
Per Domain:
$70/year (one-time charge for .com domains)
Per Inbox:
- $17/month (billed yearly)
- $20/month (billed quarterly)
Minimum 10 inbox slots required
Let’s say you’re managing 5 domains and need 10 inboxes for your cold outreach setup:
- Domains: 5 domains x $70/year = $350/year
- Mailboxes: 10 inboxes x $17/month = $170/month, totaling $2,040/year
👉 Total Annual Cost: $2,390/year
Includes inbox creation, domain setup, DNS config, automated warmup, rotation, and real-time alerts.
Mailscale vs Infraforge performance graph:
✅ What I Liked Most
- When I needed to launch 100 inboxes for a lead gen client, InfraForge saved me hours.
- No DNS guesswork.
- No switching between warmup tools and domain hosts. Everything — from domain config to warmup — was done in one place.
- We were outreach-ready in under 24 hours.
What Makes InfraForge Better Than MailScale
Warmforge – A Reliable Warmup-Only Tool for Existing Inboxes
Warmforge is a dedicated warmup platform that keeps your emails out of spam by simulating human-like sending behavior.
It doesn’t create inboxes or set up domains, but if your infrastructure is already in place, it’s a solid option to keep inboxes healthy.
What Warmforge Offers
Warmforge helps you maintain your sender reputation by warming up inboxes safely, using real-looking email activity. Here's how it works:
It warms up the inboxes you already have
Just connect your Gmail, Outlook, or custom accounts — no setup headaches or extra tools needed.
It simulates natural email activity
Sends, opens, and replies to emails in a way that looks real, helping you avoid spam folders.
It checks your inbox settings for issues
Runs health checks on DNS and MX records to catch any technical problems before they affect deliverability.
It includes inbox placement testing
You get a free monthly test to see whether your emails are landing in inbox or spam.
It focuses only on warming — nothing else
A lightweight tool designed to keep your sender reputation strong without doing too much.
It’s ideal if you already have inboxes set up
If you just need a warm-up and don’t want to switch tools, Warmforge fits in easily.
Warmforge Pricing — Straightforward and Affordable
- Per Mailbox (Slot): 1 mailbox being warmed up
$12/month (billed monthly)
Discounts may apply for quarterly/annual plans - Minimum Required:
You need to select at least 1 slot, but plans typically scale with the number of mailboxes
(e.g., if you're warming 10 inboxes, you'll need 10 slots)
Let’s say you require 10 slots
- 10 Slots x $12/month = $120/month
- Total Annual Cost (if billed monthly): $1,440/year
Mailscale vs Warmform Email warmup health:
✅ What I Liked Most
- We plugged in 30 inboxes for a client who already had their own domain.
- Setup took minutes. Warmup kicked in right away.
- It didn’t get in the way — it just did its job quietly and reliably.
What Makes Warmforge Better Than MailScale
Smartlead.ai – A Warmup + Outreach Combo for Cold Email Teams
Smartlead.ai is an all-in-one cold email tool that handles both inbox warmup and outreach campaigns on one platform.
You can create inboxes, warm them, send emails, and track replies — all from the same dashboard.
It’s great if you want everything under one roof without using separate tools for sending and warming.
What Smartlead.ai Offers
Smartlead combines warmup, inbox rotation, and outreach into a single dashboard. Here’s how it helps:
It handles warmup and outreach in one place
No need for two tools — Smartlead lets you send campaigns and warm inboxes from the same dashboard.
It makes sequence building easy
You can set up follow-ups, delays, and personalization with a simple drag-and-drop interface.
It protects your inboxes with smart rotation
Emails are sent from multiple inboxes to avoid getting flagged and to keep things safe at scale.
It gives you real-time performance tracking
You’ll see opens, replies, bounces, and spam issues as they happen — no guessing.
It needs very little setup to get started
There’s no complex DNS configuration — just connect your inboxes and go.
It’s great for teams that want to move fast
If you want to warm inboxes and run outreach campaigns in one place, Smartlead makes it simple.
Pricing — All-in-One, Still Affordable
- Basic – $39/month
2,000 leads, 6,000 emails/month, inbox warmup, basic outreach.
✅ For small teams getting started. - Pro – $94/month
30,000 leads, 150K emails/month, warmup + advanced CRM.
✅ Best for fast-growing outreach teams. - Custom – From $174/month
Up to 60M emails/month, extra client accounts, API access.
✅ Made for agencies and high-volume senders.
Smartlead starts at $39/month, which includes outreach, warmup, and inbox rotation.
For teams that want both features without buying two tools, this pricing is hard to beat.
It’s a solid choice if you’re just starting cold outreach and want a single tool to handle it all.
Maiscale vs Smarlead outreach:
✅ What I Liked Most
- We used Smartlead to run a small outreach campaign for a fintech startup.
- Inboxes were warmed, emails were sent, replies tracked — all from one login.
- For lean teams, this kind of setup saves time and keeps things simple.
What Makes Smartlead.ai Better Than Mailscale
Instantly.io – Warmup + Outreach for High-Volume Sending
Instantly.io is a cold email platform that offers built-in warmup and outreach features.
It’s designed for teams that want to send thousands of emails per day and need a tool that can scale.
It’s simple to use and works well for people who care more about volume and results than backend setup.
What Instantly.io Offers
Instantly focuses on helping you send more emails with fewer limitations. Here's what it provides:
It’s built for high-volume cold email
Instantly is made for sending from dozens of inboxes daily — all managed in one place.
It warms up inboxes automatically
Warmup runs quietly in the background with no need to configure anything manually.
It rotates sending across multiple inboxes
This spreads out volume so you don’t overload any one account and risk spam issues.
It uses AI to time your sends smartly
Emails go out in a human-like way, helping you avoid triggering spam filters.
It shows you what’s working and what’s not
With live data on deliverability and inbox health, you always know what to fix.
It’s ideal if you're sending at scale
Whether you’re a team or a solo founder, Instantly simplifies large cold outreach.
Pricing — Based on Sending Volume
- Growth – $37/month
Unlimited inboxes, 5K emails/month, warmup included.
✅ Great for lean teams starting outreach. - Hypergrowth – $97/month
100K emails/month, 25K contacts, inbox rotation.
✅ For teams scaling cold email quickly. - Light Speed – $358/month
500K emails/month, 100K contacts, advanced deliverability tools.
✅ Best for high-volume cold email ops.
Instantly starts at $37/month, which includes warmup, outreach features, and inbox rotation.
The more you send, the more value you get — it’s priced for teams that send at scale.
Without and with Inbox Rotation:
✅ What I Liked Most
- We used Instantly for a large B2B campaign where we had to send 10,000+ emails per month.
- It handled everything smoothly — warmup, rotation, campaign tracking.
- Best part? We didn’t need 3 tools to do it.
What Makes Instantly.io Better Than MailScale
Mailivery – Focused Warmup Tool for Deliverability Protection
Mailivery is a dedicated email warmup tool built to improve deliverability and sender reputation.
It doesn’t create inboxes or handle campaigns, but if you already have your cold email system in place, it helps keep your emails out of spam.
What Mailivery Offers
Mailivery is all about warming inboxes safely and consistently. Here’s what it does:
It focuses entirely on inbox warmup
Mailivery is not a sending tool — it’s designed to build trust with inbox providers before you launch campaigns.
It warms up your inboxes using real activity
Emails are sent and replied to between real accounts to simulate genuine engagement.
It helps fix inboxes with poor deliverability
If you’re getting flagged or starting fresh, Mailivery helps rebuild your sender reputation.
It gives you inbox placement and health reports
You’ll know when your inbox is ready to start sending cold emails safely.
It doesn’t include any outreach features
It pairs well with other tools and focuses only on keeping your inboxes healthy.
It’s perfect for preparing new or risky domains
Great for agencies and teams who want clean inboxes before launching outreach.
Pricing — Built for Focused Warmup
- Starters – $29/month
100 emails/day, 2 users, inbox warmup only.
✅ Ideal for warming a few new inboxes. - Pro – $79/month
600 emails/day, 5 users, better response rates.
✅ Great for growing teams needing safe scale. - Business – $199/month
2,000 emails/day, 10 users, analytics + advanced warmup.
✅ Best for large teams managing multiple inboxes.
Mailivery starts at $29/month, depending on your number of inboxes.
It’s more premium than some tools, but it’s laser-focused on getting your emails into inboxes.
If inbox health is your biggest concern, it’s worth it.
Mailscale vs Mailvery Inbox placement:
✅ What I Liked Most
- We used Mailivery on a domain that had spam issues.
- Within 2 weeks, spam placement dropped. Deliverability improved across all inboxes.
- It didn’t do everything, but it did the warmup part very well.
What Makes Mailivery Better Than MailScale
Which Tools Work Best for Gmail and Yahoo?
If you're using Gmail or Yahoo inboxes for cold outreach, not all tools handle them the same way.
Here's what we found during testing:
✅ InfraForge – Best for Gmail-based inbox creation
- InfraForge lets you create and warm Gmail inboxes automatically — no manual setup or browser automation.
- If you're building cold outreach on Gmail, it's the smoothest, most scalable option.
✅ Smartlead.ai – Good for both Gmail and Outlook inboxes
- Smartlead supports both Gmail and Outlook inboxes, but you’ll need to connect them yourself.
- Once set up, warmup and outreach work well on either platform.
⚠️ Mailivery & Warmforge – Compatible, but BYO inboxes
These tools work with Gmail and Yahoo, but they don’t create the accounts for you.
You’ll need to manually set up your inboxes first, then connect them to start warmup.
If you're starting from scratch and want the easiest Gmail setup, InfraForge is your best bet.
If you already have Gmail or Yahoo inboxes ready, the others will still get the job done, but expect a few more manual steps.
How To Pick the Right Mailscale Alternative for You
Not every team needs the same thing, so here’s a quick way to figure out which tool fits your setup best.
✅ Micro-Checklist Before You Decide
Ask yourself:
- Do you need to create inboxes, or are they already set up?
Tools like InfraForge handle inbox creation for you. Others like Mailivery and Warmforge don’t. - Do you just want to warm inboxes, or also send cold emails?
If you’re doing outreach too, you’ll need something with built-in sending features — like Smartlead or Instantly. - How hands-on do you want to be?
Some tools need manual DNS setup or third-party integrations. Others (like InfraForge) do everything behind the scenes. - What’s your budget per inbox or campaign?
Some tools charge per inbox. Others have flat pricing that scales. Make sure you know how many inboxes you’re planning to manage.
⚡ Quick Decision Guide
If you’re unsure, here’s a simple rule:
👉 If you’re starting fresh and want to scale fast without dealing with technical setup, go with InfraForge.
It removes 90% of the work and lets you launch faster.
Our Takeaways After Testing The Five Mailscale Alternatives
We set out to test these tools with a real goal in mind:
Set up and warm 100 email inboxes across multiple domains — fast, safely, and without technical headaches.
Here’s what we found:
If you need to scale fast, especially to 100 inboxes or more, InfraForge gives you everything in one place.
No extra tools. No tech blockers. Just better deliverability and faster cold outreach.
Conclusion
If you're trying to create and warm 100+ inboxes quickly, Mailscale might not be your only or best option.
There are tools now that do more, cost less, and give you way more control.
From all-in-one platforms like InfraForge that handle everything for you, to simple warmup tools like Mailivery and Warmforge, you’ve got smarter, faster, and more scalable alternatives.
If you’re just getting started or tired of patching tools together...
👉 Start with the InfraForge free trial.
It takes care of domains, inboxes, DNS, warmup, and rotation — no scripts, no tech hurdles.
You’ll go from idea to outreach-ready in a day — and never look back.
❓FAQs
What is the best Mailscale alternative?
If you want full automation — from inbox creation to warmup — InfraForge is the best alternative. For warmup-only, tools like Warmforge and Mailivery work well.
Can I use these tools with Gmail or Yahoo accounts?
Yes. InfraForge and Smartlead work well with Gmail. Mailivery and Warmforge also support Gmail/Yahoo, but you’ll need to bring your own inboxes.
Do I need technical skills to use InfraForge?
Nope. InfraForge handles inbox creation, domain setup, and DNS configuration for you. You won’t need to touch any settings or code.
How many inboxes can I manage with InfraForge?
InfraForge is built to scale — whether you’re managing 10 inboxes or 100+, it handles everything behind the scenes.
Is warmup still necessary in 2025?
Absolutely. Without a warmup, even the best cold emails end up in spam. Every new inbox needs a warmup period, and these tools make it safe and automated.