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.

19 checks per scan Results in seconds Free, no signup

The tool

What the Email Deliverability Checker 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.

How it works

Check your domain in three steps

1Enter your domainType any domain into the box above and start the free scan. No signup, no software.

2We inspect it liveDomain Doctor combines your authentication, PTR and blacklist status, in real time from our servers.

3Get a clear verdictYou get a plain-language result, the exact records we found, and a concrete fix if anything is wrong.

What to watch for

Common Email Deliverability Checker problems

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

Reach the inbox, not the spam folder

We fix every deliverability signal: authentication, reverse DNS, blacklists and reputation, so your email gets through.

SPF, DKIM and DMARC aligned and enforcing
Reverse DNS and FCrDNS configured
Blacklist monitoring and delisting

Fix my deliverability Talk to VASTROX about email

Hosting, VPS, business email and game servers. Free migration. Real support.

Questions

Frequently asked

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.