Note: if you're setting up integration between DotNetPanel and SmarterMail for the first time, then please ensure that you've setup SmarterMail web interface to run under IIS rather than default SmarterMail built-in web server. For more information on this topic please refer to the SmarterMail 5.x Installation and Configuration article.
SmarterMail Web Service URL - Specify the URL to SmarterMail admin web services. This URL is the URL of SmarterMail web interface + "/services" path.
Public IP Address - Select IP address that will be bound to all new mail domain created by SmarterMail. This field can not be left blank because SmarterMail will throw an error when creating a new mail domain.
Domains Root Folder - Specify the path to the folder where all mail domains will be created.
Admin Login and Admin Password - Specify administrator username and password (both are the same as for administrative web application) to access SmarterMail web services.
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".