Verify SPF, DMARC, and mail server health before you send. Catch authentication gaps that hurt deliverability.
No signup · Instant check · Works on any domain
Sign up for 500 free credits and full mailbox verification — verify individual addresses, not just domains.
Get 500 Free Credits →These three DNS signals decide whether your mail lands in the inbox or the spam folder.
Tells receiving servers which IPs are allowed to send for your domain.
Instructs receivers what to do with unauthenticated mail (reject / quarantine / none).
Confirms your domain can receive replies — a trust signal for cold outreach.
Check that your sending domain has SPF, DMARC, and healthy MX records. Missing authentication is the #1 reason cold email hits spam.
Then verify your list → Start free