Scope:
This solution applies to senders whose emails are consistently blocked by a Email Security Gateway.
Answer:
First, determine why the messages are being blocked. Examine the bounce (NDR) message that was received indicating the failed delivery for more information as to why the message was blocked. Below is a short list of reasons that may be contained within the bounce message and their meaning:
- Sender address rejected: Blocked indicates that either the sender's email address, or domain has been added to the Barracuda's customizable blocklist.
- Client host rejected: Blocked indicates that the sender's public IP address has been added to the Barracuda's customizable blocklist.
- Recipient address rejected: Blocked indicates that the recipient's email address has been added to the Barracuda's customizable blocklist.
- Message content rejected, UBE indicates that the content of the message was recognized as spam.
Link to This Page:
https://campus.barracuda.com/solution/50160000000GWZ9AAO