Trusted by 4,500+ companies!
Add Any Links — 100% Safe
We rebuilt custom domain tracking from the ground up.
Now you can include links, videos, and images in your cold emails without hurting deliverability or burning your inboxes.
Purpose-Built Infrastructure for Cold Email
We provide reliable mailboxes and domains designed specifically for outreach. Unlike Google Workspace or Outlook accounts, our mailboxes are optimized for deliverability — so your emails actually reach the inbox.
Spin up hundreds of mailboxes in minutes, connect them to Instantly, Smartlead, or any other tool, and see reply rates up to x2 higher!
Get Started in Minutes
Step 1
Register domains directly in our dashboard — they’re free!
for example: - marketingagency.co - digitalgrowth.com
Step 2
Enter mailbox names — SPF, DKIM, and DMARC are auto-configured.
for example: - nick@ - peter@
Step 3
In 10 minutes, your mailboxes are ready to export and use with any outreach platform.
See it in action
No More Deliverability Headaches
If you’re not sending images or links, your deliverability rate can hit 95%. Automatic IP rotation keeps your domains healthy — if one gets flagged, it’s instantly replaced without downtime or manual work.
A real example of deliverability is when sending over 20,000 emails per day
How many closed deals can you get?
Let’s calculate using the calculator (based on average metrics from our clients). Enter the number of mailboxes to estimate the number of sales calls and closed deals.
Save Hundreds of Hours
on setting up sending domains and email accounts
Setting up 100 mailboxes manually means registering domains, buying accounts, and configuring SPF, MX, and DKIM for each one — a process that can take days. With Maildoso, you can create 250 domains and 1,000 mailboxes in just 10 minutes, all ready to use right away.
Out-of-the-box setup
Get domains and email accounts already configured for cold outreach
Domain forwarding
All domains automatically redirect your prospects to your main site
Master inbox
Connect your email client to a single master inbox that can send and receive thousands of emails every day
Mailboxes for just $1.4!
Get some of the most competitive pricing on the market — $1.40/month with an annual plan or $1.80/month quarterly.
Domains are included for free, and they’re yours to keep even if you cancel your subscription.
Let’s compare
Setting up 400 mailboxes with Maildoso vs. Google Workspace
Maildoso
• $1.80 per mailbox;
• Domains for free;
• Great deliverability across all types of mailboxes;
• 10 minutes for complete set up;
Total: $733
Google Workspace
• $7.20 per mailbox;
• ~$10 per domain;
• Possible delivery issues with Outlook;
• Over 10 hours to register SPF, MX, and DKIM records for each domain and manually set up mailboxes;
Total: $3,880 (and tons of stress)
Real results from our clients
Looks impressive?
Deliverability Audit — Free for Customers
Running into issues? Our team of cold email experts is here to help. We’ll review your campaigns, run deliverability tests, check your copy for spam triggers and Spintax, add an unsubscribe link, and configure custom domain tracking.
...or use our free resources!
Try Our Premium AI Warmup!
Most warmup tools rely on IMAP, which email providers easily detect. Our AI agents perform real in-browser actions, making them look natural to providers. They send 100 emails per day per mailbox, helping you generate more positive engagement and fewer spam complaints.
Fly under the radar!
Save hundreds of hours on setting up sending domains and email accounts
Out-of-the-box setup
Get domains and email accounts already set up for outreach campaigns.
Domain forwarding
All domains automatically redirect your customers to a main site.
Great deliverability
Maildoso rotates IP addresses to reach perfect deliverability
Know exactly where your emails are landing
Mailbox reputation
Get domains and email accounts already set up for outreach campaigns.
The only platform that shows you where you land
Automatic daily inbox placement tests. Know exactly where your emails are landing — in the inbox or spam.
No more IP blacklisting nightmare
A dedicated IP might work well for traditional email marketing, but it's a disaster for cold email — once it's blacklisted, it's game over.
At Maildoso, we take a different approach with our advanced IP rotation system. We monitor IP deliverability in real-time, and if one gets flagged or loses reputation, we automatically rotate it out.
Your emails are sent from hundreds of IPs, so if one runs into trouble, you'll never even notice.
Manage replies with Master Inbox
Use your favorite email client
Connect your email client to a single email account that would receive and send emails through thousands of your sending accounts.
Reply to all emails from a single account
A smart system will automatically identify from what email account should be sent a reply based on conversation history. You just reply we’ll take care of the rest.
No more OOO chaos
Your inbox will never be cluttered with tons of out-of-office replies. They all archived automatically
Stop guessing what's not working
Our dedicated team of cold email experts is here to help.
As part of our service, we're happy to review your campaigns and provide actionable advice. We treat your campaigns like they're our own, and that's why our customers love working with us.
What our customers say
"Master inbox is a game changer!"
Daniel
Global Demand Gen at Improvado.io
Outbound 101: How to Fill Your Sales Team’s Calendar
Join Maildoso’s free webinar to learn the fundamentals of outbound. You'll learn how to set up cold email campaigns and get new clients every week!
13th of February
3:00 PM EST
Join our coaching program!
Become an outbound pro with our coaching program. You'll get access to training materials, campaign audits, and weekly webinars!
Book a demo with our experts
FAQ
Connect your emails easily to a favorite cold email software
BacklinkSwappers, inc.
1390 Market Street Suite 200 San Francisco, CA 94102