XGM email-security: example.com
===============================
Verdict: SPF: SPF is valid; DMARC: Enforced (p=reject)
SPF: SPF is valid (v=spf1 -all)
DMARC: Enforced (p=reject) (v=DMARC1;p=reject;sp=reject;adkim=s;aspf=s)

example.com  "v=spf1 -all"

[WARNING] DMARC: No aggregate report address (rua)
    fix: _dmarc.example.com. IN TXT "v=DMARC1; p=reject; sp=reject; adkim=s; aspf=s; rua=mailto:dmarc-reports@example.com"
[INFO] DMARC: Strict alignment enabled
[PASSED] SPF: 0 of 10 DNS lookups used
[PASSED] SPF: -all rejects unknown senders
[PASSED] DMARC: Policy is enforced with p=reject

https://xgm.ro/tools/email-security?d=example.com