Free email deliverability checker · Instant · No signup
Email Deliverability Checker
Find out if your email reaches the inbox. Domain Doctor combines SPF, DKIM, DMARC, MX, reverse DNS and blacklist status into one deliverability risk score.
VASTROX HOSTING · EMAIL · DNS · SSL
Want VASTROX to fix every issue above — for you?
Don't fix it alone. Our team configures your SPF, DKIM, DMARC, SSL, DNS and security headers correctly, then hosts you on fast NVMe infrastructure so your domain scores an A and stays there.
- Every failing check fixed and verified
- Hosting, business email, DNS & SSL under one roof
- Free migration from your current provider
What this checks
Reaching the inbox is not luck — it is authentication and reputation. Mailbox providers weigh SPF, DKIM and DMARC alignment, your MX health, your reverse DNS, and whether your sending IP is blacklisted.
Domain Doctor rolls all of these into a single deliverability verdict — Low, Medium or High risk — and explains exactly which factor is dragging you down. Fix the flagged items and your inbox placement improves.
Common Email Deliverability Checker errors
- Missing or unenforced DMARC (biggest deliverability drag)
- SPF or DKIM not aligned with your From domain
- Sending IP with no reverse DNS (PTR) record
- IP or domain on a spam blacklist
- Forward and reverse DNS that do not match (no FCrDNS)
VASTROX EMAIL DELIVERABILITY
Land in the inbox, not the spam folder
We fix every deliverability signal — authentication, reverse DNS, blacklists and reputation — so your email reaches customers.
- SPF, DKIM, DMARC aligned and enforcing
- Reverse DNS (PTR) and FCrDNS configured
- Blacklist monitoring and delisting
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Frequently asked questions
What most affects email deliverability?
Authentication (SPF, DKIM, DMARC alignment), sender reputation, reverse DNS, and not being blacklisted. Content and engagement matter too, but authentication is the foundation.
What is FCrDNS?
Forward-Confirmed reverse DNS: your IP’s PTR record resolves to a hostname that resolves back to the same IP. Many receivers require it to trust your mail.