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Email accounts that send large volumes of outbound spam messages may lead to the blocking of the sender address or sender IP by the internal global blocked list or by third-party Real-time Block Lists.

If the sender/recipient is blocked by internal global blocked list, you can do the following steps:

  1. Perform an initial check.
  2. Inform the sender/recipient that their email address is identified to have suspicious activity.
  3. Ensure that the IP/email address is safe and not compromised. If the account has been compromised, immediately change the account password.
  4. Report the IP/email address to Trend Micro Technical Support for further analysis and unblock requests.
  5. Submit a sample mail if required as additional information to the investigation.