1) Login to your velocity account and click on Settings option
2) In the next step, you will need to select a email service, please select "Rackspace" and click Connect option
3) In the dialog box, the Outgoing server will be already populated.
Outgoing server: secure.emailsrvr.com
Security: SSL Port :465
Email address: Your Dominion Email address
Rackspace password: Your DLC Email password.
4) Click Save settings option
5) One done, you will see connected status 