G Suite Email Settings

G SuiteIncoming mail (IMAP)
Server: imap.gmail.com
Require SSL: Yes
Port: 993

Outgoing mail (SMTP)
Server: smtp.gmail.com
Require SSL: Yes
Require TLS: Yes
Require authentication: Yes
Port for SSL: 465
Port for TLS/STARTTLS: 587

POP3 downloads email to a computer. Use the same SMTP settings.
Incoming mail (POP3)
Server: pop.gmail.com
Require SSL: Yes
Port: 995

More settings…

Outgoing SMTP Server:
Require logon using Secure Password Authentication (SPA) = No
My outgoing server (SMTP) requires authentication = Yes
Use same settings as my incoming mail server = Yes

Sent Items:
Do not save copies of sent items = Yes
(Note: sent messages are automatically saved in the [Gmail]/Sent Mail folder.)

Server Port Numbers
Incoming mail (IMAP): 993
Use the following type of encrypted connection: SSL

Outgoing mail (SMTP): 465
Use the following type of encrypted connection: SSL

G Suite Admin Help

Enable POP and IMAP for users

iPhone, iPad or iPod touch Email Settings

Outlook 2013 settings (~click here~)

Outlook 2010 settings (~click here~)