THE MATH NOBODY SHOWS YOU
A dead sending domain doesn't email you to say it died
Silent for weeks
A blacklisting tanks deliverability with zero warning. You keep sending into a void — and only notice when the meetings stop.
$3k–$5k+ per event
Lost pipeline during the dead window, plus 3–6 weeks to re-warm or rebuy the domain. Most teams hit this 2–4× a year.
From $39/mo
InboxSentinel watches every domain 24/7 and flags a blacklisting the day it happens — then helps you fix it, human-approved.
EVERY DOMAIN, WATCHED 24/7
This is what stops your pipeline dying silently
Continuous blocklist + SPF/DKIM/DMARC monitoring across every inbox you send from — with one-click, human-approved fixes. $9.90/inbox/mo on Guardian — less than your warmup tool.
See plans — from $39/mo →InboxSentinel watches every domain 24/7 and auto-fixes breakage before your pipeline dies · cancel anytime.