URL Forensics
Email spoofing calculator
SPF, DKIM and DMARC checks with clear recommendations. Free, without an account.
Email security
Can someone spoof this domain?
Check the domain’s published defenses against forged sender addresses. See what is weak, what is unknown and how to improve it.
Standards: SPF RFC 7208 · DKIM RFC 6376 · DKIM key strength · DMARC RFC 9989