Email Authentication
rubygems.org
SPF
passDeclares which servers may send mail for this domain.
v=spf1 include:sendgrid.net include:_spf.google.com -all
DKIM
passCryptographic signature on outbound mail (selector: google).
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzzpkAsCEYGJINFxQHH8pKhqdRXQmkzXz5HpeLN+XQq3dX/m4t1xwh498/3+41GsmFFcokCd8duVDE/PsZoOF3q17JL+bBmPBYrdinIXXQ/mqw/biSKlCYLbzAsROBfNZaVHUo0vxOJOpB1lsX8U0SoKdr5qR+3OLO6HRHAUAV9MBl/GSe6aryPO74i/xUuPtvDCdFWirJfxzMI3cOUgWMP8YITWkRYnN9Uz5y9CpM4zy4vW6y7OJnnVpdDNnBOsE9xTnu1zxn+SJf8J5JXQr3prBIx2tJNXFZQq50MdHL57AGp+8EODtsoJitYXBIqxo3AbZnChLBPKeHuCSpYEPrwIDAQAB
DMARC
passTells receivers what to do with mail that fails SPF/DKIM. Policy: quarantine.
v=DMARC1; p=quarantine; pct=100; rua=mailto:re+gxdokbuibkg@dmarc.postmarkapp.com; sp=quarantine; aspf=r;
Mail Servers (MX)
1 smtp.google.com