PPE Hosted Dispatch Mail System- Emails not delivered

What DNS Settings should I have for our Domain?  Should their be a priority number? 

MX Records
Host			Points To	Priority
1.	@	roadrunnerwy.com	mx1-usg1.ppe-hosted.com	0
2.	@	roadrunnerwy.com	mx2-usg1.ppe-hosted.com	0
3.	@	roadrunnerwy.com	mx3-usg1.ppe-hosted.com	0

THE ISSUE....

This is the PPE Hosted Dispatch mail system.

PPE Hosted tried to deliver your email message,
but was unable to do so for reasons outside our control.

We recommend contacting the person or service responsible for
looking after the recipient domain's email server directly.

The last error message we have available from the recipient's
server is included right below, along with an extract of your
email:


<britney@roughnecksupply.com>: host
    d318562a.ess.barracudanetworks.com[209.222.82.252] said: 550 permanent
    failure for one or more recipients (britney@roughnecksupply.com:blocked)
    (in reply to end of DATA command)