Any domain name utilizing our nameservers will naturally have 'smtp', 'pop3' and 'imap'.your-domain.tld hostnames made, and MX records automatically pointed. In case you're overseeing DNS remotely, or wish to utilize the stack hostnames directly, the following can be utilized to get to our mail services:
IMAP: imap.stackmail.com
POP: pop3.stackmail.com
SMTP: smtp.stackmail.com
MX: mx.stackmail.com
The above hostnames will work for all mailboxes  on our stage.
If you wish to arrange Outlook Autodiscover support, if it's not too much trouble make a CNAME for "autodiscover.yourdomain.com" to point to "autodiscover.stackmail.com".