Google Enterprise Email Management

The address of the enterprise post office management panel is: http://www.google.com/a/your domain name. You can add, modify, and delete mailboxes, and make various settings such as accounts and domain names.
Email login address: http://mail.google.com/a/your domain name This is the same email system as Gmail, which can send and receive emails and modify and set up various functions.
POP3/SMTP Settings:
pop3 server: pop.gmail.com Use ssl: yes Port: 995
SMTP Server: smtp.gmail.com Use SSL: Yes Use Authentication: Yes Port: 465
(Note that it is not pop.yourdomain.com and smtp.yourdomain.com)
IMAP Settings:
IMAP server: imap.gmail.com Use SSL: Yes Port: 993
SMTP Server: smtp.gmail.com Use SSL: Yes Use Authentication: Yes Port: 465