Public IP Address - Select "Public IP" address that will be used by your customers to access the mail server. This IP address will be shown in hosting space summary information.
Mail Account Type - Select the type of mail accounts that will be created in Merak mail server. You can choose to create a) POP3 accounts only (only POP3 protocol is allowed to access the mailbox), b) IMAP accounts only or c) IMAP & POP3 accounts where both protocols are allowed.
Verify/change mail service DNS records and their data columns. We recommend you having two (primary and backup) "A" and "MX" records for each mail service listening different IP addresses. However, if you don't have available server IP addresss or your mail server will listening only one IP address it doesn't make any sense to have an additional "mail2" A and MX records, so they can be deleted from the list.
SPF ("TXT" record of a special format) is also required for any trustworthy mail service.
You may also want to change (or add) those DNS records to allow you customers accessing mail server using "pop.mydomain.com" and "smtp.mydomain.com".