gmail.com: grade B (5 pass, 1 warn, 0 fail) in 444ms

pass  MX records 5 gmail-smtp-in.l.google.com, 10 alt1.gmail-smtp-in.l.google.com, 20 alt2.gmail-smtp-in.l.google.com, 30 alt3.gmail-smtp-in.l.google.com, 40 alt4.gmail-smtp-in.l.google.com
pass  STARTTLS   5 of 5 offer TLS with a valid certificate
pass  SPF        ~all, 1 of 10 lookups
warn  DMARC      p=none
      see https://kirkdiamond.com/guides/dmarc-none-vs-quarantine-vs-reject
info  DKIM       no common selectors found
      see https://kirkdiamond.com/guides/spf-vs-dkim-vs-dmarc
pass  MTA-STS    mode: enforce
pass  TLS-RPT    v=TLSRPTv1;rua=mailto:sts-reports@google.com

mx (MX)
    5 gmail-smtp-in.l.google.com               starttls=yes TLS 1.3 cert=valid
   10 alt1.gmail-smtp-in.l.google.com          starttls=yes TLS 1.3 cert=valid
   20 alt2.gmail-smtp-in.l.google.com          starttls=yes TLS 1.3 cert=valid
   30 alt3.gmail-smtp-in.l.google.com          starttls=yes TLS 1.3 cert=valid
   40 alt4.gmail-smtp-in.l.google.com          starttls=yes TLS 1.3 cert=valid

spf (1 lookups, 0 void)
  gmail.com: v=spf1 redirect=_spf.google.com
    _spf.google.com: v=spf1 ip4:74.125.0.0/16 ip4:209.85.128.0/17 ip6:2001:4860:4864::/56 ip6:2404:6800:4864::/56 ip6:2607:f8b0:4864::/56 ip6:2800:3f0:4864::/56 ip6:2a00:1450:4864::/56 ip6:2c0f:fb50:4864::/56 ~all

dmarc
  v=DMARC1; p=none; sp=quarantine; rua=mailto:mailauth-reports@google.com

mta-sts: v=STSv1; id=20190429T010101;
  version: STSv1
  mode: enforce
  mx: smtp.google.com
  mx: gmail-smtp-in.l.google.com
  mx: *.gmail-smtp-in.l.google.com
  max_age: 86400
  cache: 1 day
  covered: gmail-smtp-in.l.google.com, alt1.gmail-smtp-in.l.google.com, alt2.gmail-smtp-in.l.google.com, alt3.gmail-smtp-in.l.google.com, alt4.gmail-smtp-in.l.google.com

tls-rpt: v=TLSRPTv1;rua=mailto:sts-reports@google.com