We are responsible for the email server which uses the following IP (s) for sending emails:
Symantec is improperly blocked our IP (s).
We have already requested unlocking more than 3 times and the lock occurs again.
We identified the issue after our client polygoengineering.com lost connection with the @ mrv.com domain.
Correction in addresses that problem occurs:
@poligonoengenharia.com.br to @mrv.com.br