Unverified50% confidenceReleaseExact time
The author built an email deliverability check API that in one call returns SPF/DKIM/DMARC/MX/rDNS verdicts for a domain, along with remediation tips.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/13/2026
First Seen
Valid until: 1/11/2027
Sources
Related Entities
Related Claims
VerifiedDMARC is an email authentication protocol built on top of SPF and DKIM that allows domain owners to tell receiving parties how to handle emails that fail authentication.72% similarVerifiedSPF declares authorized IPs via DNS TXT records, DKIM adds a digital signature to email headers via asymmetric encryption to verify that content has not been tampered with, and DMARC defines handling policies for authentication failures and provides aggregate reports.71% similarVerifiedProfessional email sending practices include using mailbox warm-up tools to build domain reputation, configuring SPF/DKIM/DMARC domain authentication records, and controlling daily sending volume and sending intervals.71% similarVerifiedSPF通过DNS TXT记录声明哪些IP地址被授权代表某域名发送邮件69% similarUnverifiedEmail verification checks whether an address actually exists via SMTP handshake or DNS record lookup, thereby filtering out invalid addresses before sending and reducing bounce rates.69% similar
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