50M+ EMAILS SENT MONTHLY Trusted by 200+ Teams

Your  Cold Email Infrastructure 

Small drops in deliverability can lead to huge losses in replies and pipeline. If that's happening to you, we built an SMTP cold email infrastructure that works. Finally, your team can say goodbye to the spam folder!

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Setup in 5 minutes Pay for what you use
 Auto DNS Setup
Mission Inbox
Main
Dashboard
Messages
Projects
Domains
Mailboxes
Incoming:—
Outgoing:—
Msg Rate:—
Held:—
Queued:—
Dashboard
Search…
Ask Elimo New
Send Requests
12,450
than last month
+26.7%
Credits Used
15,420
current billing period
IPs in Use
5
1 active warm-up
Mailboxes
8
3 warming up
Email Activity
Today
3 Days
7 Days
30 Days
90 Days
5,574
Send Requests
192
Bounces
98
Spam
Inbox Placement Rate
99% avg delivery

Trusted By Teams Sending 50M+ Emails Monthly

Trusted by Y Combinator startups, top cold email agencies and enterprises sending 50M+ emails per month.

understory
SuperSend
MARTAL GROUP
LAND BASE
LEAD GEN JAY
HIPCAMP
Why Teams Switch to Mission Inbox

Everything Cold Email
Deliverability Deserves

Built from the ground up for teams that can't afford deliverability guesswork.

Dedicated IP Infrastructure

Your cold email program runs on your IPs, never mixed with others. Full ownership, full isolation, zero reputation bleed.

AI Shield Protection

MI Shield monitors your reputation 24/7,  preventing deliverability issues and spam content from tanking your reply rates.

Workload-Specific Lanes

Dedicated SMTP Cubes for your cold email revenue engine. One bad campaign can't stall your pipeline again.

SMTP + RESTful API

Plug in via standard SMTP or our blazing-fast OBMEngine API. Less than 50ms latency. Integrates with any stack in minutes.

Higher Inbox Placement

With pre-send checks, dedicated IPs and workload specific sending ranges your reps can inbox more with fewer accounts.

Email Deliverability Analytics

Live dashboards for managing IP ranges, projects, spam complaints, and domains. Monitor the pulse of every component in your email deliverability stack.

Mission Inbox By The Numbers

50M+
Emails/Month
99%
Avg Inbox Rate
200+
Teams Sending
<50ms
API Latency
4.9★
Avg Rating
Head-to-Head

Mission Inbox vs. The Rest

See why teams migrating from legacy providers never look back.

Mission Inbox Best Mailforge Infraforge Maildoso
Dedicated IPs ✓ ✗ ✓ ✗
AI Reputation Shield ✓ ✗ ✗ ✗
Workload Isolation ✓ ✗ ✗ ✗
SMTP + API Support ✓ ✗ ✓ ✗
Avg Inbox Placement Rate 99% ~90% ~86% ~87%
Audit-Ready Compliance ✓ ✗ ✗ ✗
Price (equivalent sending capacity) $199/mo $150/mo $250/mo $200/mo *

Prices based on comparable sending volumes. Data as of Mar 2026.

Plug & Play

Works with the tools
you already love

Connect Mission Inbox to your outreach stack in minutes — no dev work, no headaches.

Connected

Instantly

SMTP mailboxes for your Instantly campaigns to improve deliverability. 5 min setup, and pay only for usage.

Connected

Smartlead

Improve deliverability for your Smartlead campaigns using Mission Inbox's SMTP delivery muscle. 

COMING SOON

lemlist

Supercharge your lemlist campaigns with SMTP infrastructure that matches your personalization quality. Stop brilliant copy from landing in spam.

Set up in under 2 minutes, just bring your API Key

Connect your tool
SMTP Mailboxes

Inbox More With SMTP Mailboxes

Standard SMTP protocol with isolated IP-based infrastructure for cold email. Perfect for sales teams, agencies, and enterprises that need dedicated mailboxes to scale their campaigns.

Isolated Infrastructure

Your own dedicated IPs and domains, completely isolated from other senders. Never worry about shared IP reputation affecting your deliverability.

  • Dedicated IP addresses for your sending
  • Separate domains for each workload
  • Protected from other senders' reputation
100% Isolation 99.9% Uptime

Instant SMTP Setup

Connect via standard SMTP protocol and start sending in minutes. No complex configuration, no technical expertise required.

  • Standard SMTP protocol support
  • Works with any sequencer - Smartlead, Instantly and others
  • Real-time delivery monitoring
<5min Setup <50ms Latency

Enterprise Security

Bank-level encryption and security for all your email communications. Full compliance with industry standards and regulations.

  • TLS 1.3 encryption for all connections
  • SOC 2 Type II certified infrastructure
  • GDPR and CCPA compliant
TLS 1.3 SOC 2

99% Inbox Placement Rate

Guaranteed deliverability with dedicated infrastructure and reputation management. Your emails land in the inbox, not spam.

  • Dedicated IP reputation management
  • Automatic warmup and optimization
99% Inbox Rate 99.9% Delivery
Start Sending
Includes 30 mailboxes, 10K sends, and dedicated IPs. No hidden fees.
Wall of Love

You are in good company

B2B Sales Leaders, Founders, and Agency owners trust Mission Inbox for their cold email infrastructure.

Your Emails Deserve the Inbox.
Start Sending With Confidence.

Join 200+ teams who stopped gambling with shared IP pools and took ownership of their email infrastructure.

GET STARTED TODAY
Dedicated IPs Live in 5 minutes Pay only for usage