G Suite (Google Apps) change primary domain name, customize email settings

I previously applied for the free version of G Suite (Google Apps) for 50 users and wanted to change the primary domain name, but was unsuccessful. Finally, I found a paid service that cost a total of US$6 and was done in less than an hour.
1. Change the primary domain address of G Suite (Google Apps): https://www.fiverr.com/gsuite/change-primary-or-secondary-domain-in-google-apps-g-suite

2. Customize your email account by entering the control panel https://admin.google.com/your domain name, setting it in Company Profile-Custom URL and adding cname.
Google Mail IMAP Settings:
Incoming mail (IMAP) server:

 imap.gmail.com要求SSL：是端口：993

Outgoing Mail (SMTP) Server:

 smtp.gmail.com要求SSL：是要求TLS：是（如適用）使用身份驗證：是SSL 端口：465 TLS/STARTTLS 端口：587

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