Comparison
Mailgun Built for Developers.
Not for Sales Teams.
Mailgun is a developer-first transactional email API. Great for receipts and notifications—terrible for cold outreach. They restrict cold email, use shared IPs, and offer no domain protection.
Comparison
At a Glance
The differences that matter for cold email
Feature
Cold Email Policy
Infrastructure
AI Protection
Setup Time
.avif)
Outreach-Friendly
Isolated Servers
MI Shield™ Included
<5 Minutes
MailGun
Banned & Suspended
Shared IP Pools
None
2-3 Days
Outreach-Friendly
Isolated Servers
MI Shield™ Included
<5 Minutes
Start Sending
MailGun
Banned & Suspended
Shared IP Pools
AI Protection
2-3 Days
See the difference true infrastructure isolation makes
Get Started with Mission Inbox
features
Why Choose Us
Everything you need for reliable, scalable email delivery
Mailgun's Limitation
Built for Receipts.
Not for Prospecting.
Not for Prospecting.
Mailgun is a developer-first API for transactional emails: password resets, order confirmations, notifications. Their compliance filters flag cold email as "unsolicited" and restrict your account.
Cold Email Restrictions
Mailgun's ToS restricts "unsolicited emails." Cold outreach gets flagged and limited.
Strict Compliance Filters
Built for transactional emails. Outreach patterns trigger automatic restrictions.
Shared IP Reputation Risk
Your emails share IPs with thousands of developers. One bad sender affects everyone.
Mission Inbox Solution
OBM Engine™: Built for Outreach
Mission Inbox is outreach-first infrastructure. We don't restrict cold email—we protect it with isolated servers, AI pre-send checks, and dedicated IPs specifically for prospecting.
Outreach-Friendly Policy
Built for cold email. No restrictions, no compliance filters blocking legitimate outreach.
MI Shield™ Protection
AI scans every email before sending. Blocks spam patterns to protect your domain.
Isolated Infrastructure
Dedicated IPs and servers for outreach. Your reputation is 100% yours.
Developer Pools vs. Dedicated Lanes
Mailgun's shared IPs mix your sales emails with password resets and notifications from thousands of apps. Mission Inbox gives you isolated infrastructure for outreach.
Mailgun
Shared Developer Pools
Mixed traffic: receipts, notifications, and your outreach
Shared IPs with thousands of developers
One bad app ruins deliverability for everyone
No control over reputation management
Result: Unpredictable inbox rates for sales emails
Mission Inbox
Isolated Outreach Infrastructure
Dedicated servers for outreach only
Your IPs, your reputation, your control
No shared risk from other senders
Consistent 98% inbox rate for cold email
Result: Predictable deliverability you can trust
Scale Beyond Compliance Filters
Mailgun's strict compliance filters limit outreach volume. OBM Engine scales from 1,000 to 100M+ emails without restrictions.
Mailgun: Compliance Bottlenecks
Volume limits for "unsolicited" emails
Manual review required for scale
Compliance filters block legitimate outreach
No infrastructure for cold email growth
Account restrictions at high volume
Mission Inbox: Automated & Fast
No volume limits for outreach
Auto-scaling infrastructure
MI Shield protects without blocking
Built for cold email at scale
From 1K to 100M+ emails seamlessly
The Verdict: Who Is This For?
Stick with SendGrid if:
You only send transactional emails (receipts, notifications)
You're a developer building an app, not a sales team
You never do cold outreach or prospecting
You're okay with shared IP reputation risk
Switch to Mission Inbox if:
You do cold email outreach or prospecting
You want isolated infrastructure for outreach
You need to scale beyond compliance filters
You want AI protection for your domain reputation
Stop Fighting Mailgun's Compliance Filters
Switch to outreach-first infrastructure with isolated servers, AI protection, and unlimited scale. Start sending in under 5 minutes.
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