Maildoso - B2B Cold Email Software for Outreach & Deliverability

Mailboxes Built

for Outbound

Launch trusted mailboxes that protect your sender reputation and keep your emails out of spam

Trusted by 4,500+ companies!

Add Any Links — 100% Safe

We've 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 mailboxes.

Purpose-Built Infrastructure for Cold Emailing

We provide reputable mailboxes and domains designed specifically for outreach. Unlike Google Workspace or Outlook accounts, our mailboxes are optimized for deliverability — so your emails actually land in an inbox.

Set 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

examples: - marketingagency.co - digitalgrowth.com

Step 2

Enter mailbox names. SPF, DKIM, and DMARC are auto-configured.

examples: - 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 automatically replaced, with zero downtime

Deliverability rates 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, and use them right away.

Out-of-the-box setup

Get domains and email accounts that are 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 a 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

• High inbox reach across all types of mailboxes

• 10 minutes for complete setup

Total: $733

Google Workspace

• $7.20 per mailbox

• ~$10 per domain

• Possible delivery issues with Outlook

• 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, and check your copy for spam triggers and Spintax.

...or use our free resources!

Deliverability Guide →

Guide for beginners →

Copywriting Guide →

Knowledge base →

Slack Community →

Try Our Premium AI Warmup!

Most warmup tools rely on IMAP, which is easily detectable by email providers. Our AI agents perform real in-browser actions to make them appear natural. They send 100 emails per day per mailbox, helping you generate more positive engagement and fewer spam complaints.

Fly under the radar!

Instead of sending hundreds of emails from a single domain, send them out from dozens of domains. Maildoso automates domain setup, mailbox creation process, reputation monitoring and helps you get more replies.

Save hundreds of hours on setting up sending domains and email accounts

Forget about SPF, MX, DKIM, and other DNS things. No matter how many sending domains and email accounts you need, get them all set up properly in no time.

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 one email account to operate thousands of them

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.