Comparison
Resend: Beautiful Developer UX.
Wrong Tool for Cold Email.
Resend is a modern developer API for transactional emails—password resets, welcome emails, notifications. But it's built on shared AWS SES infrastructure and explicitly bans cold outreach.
Comparison
At a Glance
The differences that matter for cold email
Feature
Cold Email Policy
Infrastructure
AI Protection
Scale Capability
.avif)
Outreach-Friendly
Isolated Servers
MI Shield™ Included
100M+ Emails
Resend
Banned & Suspended
Shared AWS SES
None
Limited by AWS
Outreach-Friendly
Isolated Servers
MI Shield™ Included
<5 Minutes
Start Sending
Resend
Banned & Suspended
Shared AWS SES
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
Resend's Limitation
Beautiful DX for Developers.
Not for Sales Teams.
Not for Sales Teams.
Resend offers a modern, React-friendly API for transactional emails. Great for SaaS notifications—but their Terms of Service explicitly prohibit cold email and marketing outreach.
Cold Email Prohibited
Resend's ToS explicitly bans "unsolicited commercial emails." Cold outreach violates their policy.
Built on AWS SES
Resend is a wrapper around AWS SES. You inherit AWS's strict compliance rules and shared infrastructure.
No Domain Protection
No AI pre-send checks. If your email looks like spam, you'll burn your domain reputation.
Mission Inbox Solution
Built for Outreach from Day One
Mission Inbox is purpose-built for cold email. We don't prohibit outreach—we protect it with isolated infrastructure, AI pre-send checks, and dedicated IPs specifically for prospecting.
Cold Email Friendly
Built for outreach. We don't ban cold email—we help you do it right.
Own Infrastructure
Not a wrapper. We own and operate dedicated servers and IPs for outreach.
MI Shield™ Protection
AI scans every email before sending. Blocks spam patterns to protect your domain.
AWS Wrapper vs. Own Infrastructure
Resend is a beautiful API wrapper around AWS SES. But you inherit AWS's shared infrastructure and strict compliance rules. Mission Inbox owns and operates dedicated servers.
Resend
AWS SES Wrapper
Built on top of AWS SES shared infrastructure
Subject to AWS's strict compliance rules
Shared IP pools with other AWS users
Limited control over deliverability
Result: Beautiful API, wrong infrastructure for outreach
Mission Inbox
Own Infrastructure
Own and operate dedicated servers and IPs
Built for outreach, not transactional emails
Isolated infrastructure per customer
Full control over reputation and deliverability
Result: Purpose-built infrastructure for cold email
Scale Beyond AWS Limits
Resend inherits AWS SES volume limits and compliance restrictions. OBM Engine scales from 1,000 to 100M+ emails without AWS bottlenecks.
Resend: AWS SES Limits
Subject to AWS SES sending limits
Compliance reviews required for scale
Shared infrastructure bottlenecks
Cold email prohibited by ToS
Limited to transactional use cases
OBM Engine™: Unlimited Outreach
No AWS limits—own infrastructure
Auto-scaling for any volume
Built for cold email at scale
From 1K to 100M+ emails seamlessly
MI Shield protects without blocking
The Verdict: Who Is This For?
Stick with SendGrid if:
You only send transactional emails (receipts, notifications)
You're a developer building a SaaS product
You never do cold outreach or prospecting
You want React email templates and modern DX
Switch to Mission Inbox if:
You do cold email outreach or sales prospecting
You want own infrastructure, not AWS wrapper
You need to scale beyond AWS SES limits
You want AI protection for your domain reputation
Beautiful API. Wrong Infrastructure.
Switch from AWS SES wrapper to purpose-built outreach infrastructure. Isolated servers, AI protection, unlimited scale.
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