Email security report card · 2026-11-07
github.com
github.com scores 70/100 (grade C). Legitimate mail proves where it comes from, so Gmail and Outlook trust it. Forged mail “from” github.com is sent to spam by the big inboxes. 21 lookalike domains can receive email; none registered recently. The most valuable next step: turn on MTA-STS.
C70/100
| Area | Check | Status | Points |
|---|---|---|---|
| Authentication | SPF and DKIMYes — your mail proves where it comes from. SPF: SPF lists the servers allowed to send as you. DKIM: Your mail carries a signature inboxes can verify (1024-bit, 2048-bit, 1024-bit, 2048-bit, 2048-bit, 2048-bit, 2048-bit, 1024-bit). | Pass | 25/25 |
| Anti-spoofing | DMARC enforcementMail that fails your checks goes to spam. | Pass | 26/30 |
| Delivery | Google, Yahoo and Microsoft sender rulesYes — you meet the published sender requirements. | Pass | 15/15 |
| Encryption | MTA-STSWithout it, an attacker on the network path can downgrade delivery to unencrypted. | Missing | 0/8 |
| Encryption | TLS-RPTAdd a TXT record at _smtp._tls.github.com: v=TLSRPTv1; rua=mailto:tls-reports@github.com | Missing | 0/4 |
| DNS hardening | DNSSECNot signed. Turn on DNSSEC at Amazon Route 53; if the domain is registered elsewhere, add the DS record it gives you at your registrar. | Missing | 0/8 |
| DNS hardening | CAAOnly digicert.com, globalsign.com, letsencrypt.org, sectigo.com may issue certificates. | Pass | 4/4 |
| Brand | BIMI logoYour DMARC already qualifies. Publish an SVG logo at default._bimi.github.com; Gmail and Apple also need a mark certificate. | Missing | 0/6 |
What if you fixed…
Today C 70/100
Fix next
- Turn on MTA-STS
- Turn on DNSSEC
- Turn on BIMI logo
- Turn on TLS-RPT
Exact records and where to click: full check for github.com.
Lookalike exposure
48 registered lookalikes, 21 able to receive email. Not graded: you can’t control who registers them.