There are two ways you can access Email for Business or Enterprise Mail Server
1> Webmail: webmail.yourdomainame.com
2> Using any Mail Client (Outlook / Android Mail / Thunderbird / IOS Mails Settings)
The setting for Mail client are
POP Server: pop.abc.com
Incoming mail server port (POP): 110
IMAP Server: imap.abc.com
Incoming mail server port (IMAP): 143
SMTP Server: smtp.abc.com
Outgoing mail server port: 25/587 / 465