When setting up your email client for use with the Professional Email Hosting (the M1, M2, M3, or M4 plans). You would use the following hostname for incoming and outgoing mailserver names.
You will want to use SSL for the connection with the following information.
incoming pop3 – 995
incoming imap – 993
outgoing smtp – 465 or 587
You can also login to webmail by going to https://mxs.net.au