Contrary to the quarantine -which is meant to help in exploring each blocked message- the communication logs are best used for specific diagnosis. Because of the impressive number of entries, the logs aren't meant to be monitored line by line.
The Communication Logs can be found under:
My Organization → Logs
| Date and time
|| Date/time of message reception
|From|| Sender's email address
|To|| Recipient's email address
| IP address
|Filtering|| Whether email filtering considered the message Accepted or Blocked
|Delivery|| Whether our filters were able to relay the message to your server. Statuses are Delivered, Failed or Ongoing
|View|| A link that allows the user to consult the log excerpt to gather more information
Searching the logs
Understanding Search Results
- If there are no results, it could be because the search terms are incorrect.
- Remember to search using the SMTP-From and SMTP-To address.
- If a date/time was specified, maybe widen the search window.
- If you have multiple domains, make sure you're searching the logs for the correct domain.
- If, having re-checked your search terms, there are still no results, it may be that the message never reached our filters.
- When viewing the search results, the Filtering and Delivery columns give a brief overview of what happened with the message.
- For more details, click the View link. This will give you more detailed information (eg.: bounce message, your server's SMTP confirmation, the temporary SMTP error returned by your server, etc).