Mailmax is tightly integrated with webppliance for windows. You should not uninstall mailmax from webppliance for windows. If you uninstall mailmax then you will get traceback errors while viewing the plan details.
If some other mail server has to be used instead of mailmax then the following related services of mailmax have to be stopped and disabled.
MailMax SE - ImapMax IMAP4
MailMax SE - MailMax SMTP
MailMax SE - PopMax POP3
MailMax SE - QueMax
A new plan also has to be created with the mail server option disabled and then new sites have to be added with this plan.
If your mail server provides a URL-based interface, you can add a link to it on the customizable left navigation bar of the WEBppliance for Windows. However, the mail server’s functionality will not be integrated with the Ensim Control Panels.