Issue regarding black listed IP from MessageLabs

Dear support,

We are facing a trouble to send messages, the IP 67.219.246.209 (from Symantec MessageLabs) is blacklisted.

And we're not able to send e-mails when the outbound traffic goes from this IP.

Could you please help me?

Below you can see the error message:

"This is the mail delivery agent at Symantec Email Security.cloud.

 I was unable to deliver your message to the following addresses:

 xxxx@xxxx.com.br 

 Reason: 550 5.7.1 67.219.246.209 listed at ubl.unsubscore.com"

Regards.

Erick Machado