Developer Tools Medium 3,400/mo

Email Deliverability Monitor

Track email delivery rates, spam scores, and domain reputation for transactional email. Know WHY your emails go to spam and fix it before customers notice.

EmailMonitoring
MRR Potential
$10K–$40K
Time to MVP
8–10 weeks
Search Volume
3,400/mo
Market Size
$2.2B

The Problem

20% of legitimate emails never reach the inbox. SPF, DKIM, and DMARC misconfiguration causes spam classification. Email deliverability degrades silently until customers complain. No tool monitors reputation across Gmail, Outlook, and Yahoo. Blacklist monitoring is fragmented across multiple services. Password reset emails in spam = lost customers.

The Solution

Email deliverability monitoring platform that tracks inbox placement rates, monitors domain reputation, validates authentication (SPF/DKIM/DMARC), and alerts when deliverability degrades — before customers stop receiving your emails.

Target Audience

Engineering teams sending transactional email via SendGrid/SES, marketing teams with deliverability problems, and email service providers needing monitoring for clients

Key Features

1
Inbox placement testing across Gmail, Outlook, Yahoo, and corporate email
2
Domain reputation monitoring with blacklist checking across 100+ lists
3
SPF, DKIM, and DMARC validation with misconfiguration detection
4
Deliverability trend dashboards showing placement rates over time
5
Spam score analysis for email templates before sending
6
Alert notifications when deliverability drops or blacklists are detected

Market Opportunity

Market Size
$2.2B — Email deliverability and monitoring growing at 14.5% CAGR
Monthly Searches
3,400/mo
MRR Potential
$10K–$40K
Why Now?

Gmail and Microsoft are enforcing stricter authentication. Transactional email deliverability directly impacts revenue. DMARC enforcement is increasing. Email authentication complexity is growing. Email is still the #1 customer communication channel.

Revenue Model

Free: 100 tests/mo, 1 domain. Pro: $29/mo (500 tests, 3 domains). Team: $79/mo (2,000 tests, 10 domains). Enterprise: $199/mo (unlimited + API). Annual: 20% discount.

Competitive Landscape

GlockApps

Email testing. $59+/mo, inbox testing, established

MXToolbox

Email diagnostics. Free–$99/mo, DNS-focused, basic deliverability

SendGrid/Mailgun built-in

Basic stats, no inbox placement testing, no reputation monitoring

Manual testing

Send to personal Gmail, hope for the best, no systematic monitoring

Recommended Tech Stack

Next.jsNode.jsPostgreSQLSMTP testingDNS resolverStripeSendGrid

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