Shell scripts for taming the SPF (Sender Policy Framework) records in order to fight 10-maximum-DNS-look-ups limit.

Postfix SMTP relay docker image

Find Email Spoofing Vulnerablity of domains

Mail server

List of "big mailers" for OpenBSD's 'smtpctl spf walk' mechanism

Update ipset based on RIRs and GeoIP

📪 list mailservers from spf entries

Bash script to detect SPF, DKIM, and DMARC issues that expose domains to spoofing

It's an older email, sir, but it checks out - Email authentication checker

Bulk domain email security lockdown tool that prevents email phishing and spoofing attacks by automatically configuring SPF hard fail, null MX records, and DMARC rejection policies on unused Cloudflare-managed domains.

All-In-One Dockerized MTA (Relay Only) including Postfix, STARTTLS (Letsencrypt), SPF, OpenDKIM, OpenDMARC.

Docker Postfix SMTP Relay with support for rewriting canonical names

Check if a DNS zone is correctly set compared to its known value.

🛡️ Strengthen your domain's security with DomainShield, a tool that automates DNS and email assessments to identify vulnerabilities and generate reports.

Automated security assessment tool for domain infrastructure. Performs comprehensive DNS analysis, email authentication validation (SPF/DKIM/DMARC), and network security scanning. Generates professional HTML reports with actionable findings.