You can add MX records for your domain in the Universal Pipe DNS Management tool found at:
If your domain is not listed you can create the domain within this tool. Otherwise, click on the domain name for which you wish to add an MX record. Scroll to the "Mail Exchanger (MX) records" section. Add the MX record information. "Click on the Generate zone configuration" button to save your changes.
It will take up to an hour for the DNS changes to propagate to the Upipe name servers (dns3.speedingbits.com and dns4.speedingbits.com).