Email Authentication

pnas.org

SPF

pass

Declares which servers may send mail for this domain.

v=spf1 ip4:65.156.0.0/23 include:sendgrid.net ~all

none

Cryptographic signature on outbound mail (selector: none).

No record published.

warning

Tells receivers what to do with mail that fails SPF/DKIM. Policy: none.

v=DMARC1; p=none; rua=mailto:security-dmarc@nas.edu