After the opening of China Telecom Enterprise Mailbox, please do two DNS records (MX record, SPF (anti-counterfeit rebel garbage) TXT record) settings.
The first step: log in to your domain name resolution platform (enter the domain name, password) and go to the MX record Maintenance page.
Step Two: set the domain name MX record: Point to mta-ent.21cn.com. Priority set to: 10
Mailcdn.21cn.com. Priority set to: 15
Step Three: change the TXT setting to: V=spf1 include:corp.21cn.com. -all
Fourth Step: Save the changes so that you have successfully completed the DNS parameter settings.
21CN is a special optimization for overseas receiving, if you receive overseas mail more frequently, you must ask you to cooperate with the Change MX record optimization level:
ABC.com priority of mailcdn.21cn.com.
ABC.com Priority-mta-ent.21cn.com.
Note: MX record in "IP address/hostname" Please fill in the full name of the complete domain, such as mta-ent.21cn.com., must be "." End.
You can also contact your domain name provider to make a DNS record of your domain name.
DNS Settings--Enterprise Mailbox Business Edition