Email Authentication
jb51.net
SPF
passDeclares which servers may send mail for this domain.
v=spf1 include:spf.mail.qq.com ~all
DKIM
noneCryptographic signature on outbound mail (selector: none).
No record published.
DMARC
noneTells receivers what to do with mail that fails SPF/DKIM.
No record published.
Mail Servers (MX)
5 mxbiz1.qq.com
10 mxbiz2.qq.com