Yes, bmx.01.com is our backup mail exchange (mx) server. 

MX records should only be configured after you have successfully signed up for service, used the domain admin control panel to add all of your mailboxes, aliases and distribution lists, and read through our Getting Started section in our online help desk to verify you're prepared to start receiving email at 01.com.

Here are our MX record DNS settings, where 10, 20, 30 are the priority of the servers (mx.01.com is checked first, mx-a.01.com second, bmx.01.com third):

10 mx.01.com
20 mx-a.01.com
30 bmx.01.com

Your own domain is typically listed to the left of the priority,  and some DNS hosts require a trailing period, for instance, "mx.01.com.".  We have step-by-step documentation for configuring your MX records for the the top DNS hosts in our online help desk, available to you after automated sign-up. 

Note that while mail stored on bmx.01.com is not viewable to clients, bmx.01.com will queue and forward mail for our clients' domains in the event the destination server is unreachable, such as during scheduled maintenance (clients, please see our help desk News for our maintenance schedule). Also, bmx.01.com will queue messages for up to 5 days in the event of a disaster.

Please note that when you place your order, your chosen domain is configured automatically on the 01.com servers.  Mail will not be directed to your domain on the 01.com servers until you change your MX record in your DNS.  The exception to this rule is for existing clients using the 01.com servers, including 01.com team members: for these users, the 01.com mail server will attempt delivery only to the domain installed locally.  For example, prior to switching your MX record, if you're wondering why you haven't received responses from 01.com team members, check your mailbox on the 01.com server, because our messages, sent through the 01.com servers, will be delivered there.