How to determine why the Header Checking spam filter blocked or allowed a message

Answer

If you are questioning why an email was blocked or allowed by the Header Checking spam filter and would like more information, you can find further details in the log file for that filter. Use the following procedure to find the log and information regarding your message within it, and then use the examples below to interpret why the message was either blocked or allowed:

1. Find the message ID of the email in question by either gathering it from the headers of the message itself, or by looking for it in the MailEssentials Dashboard > Logs > Details tab
2. Open the ase_header_check.gfi_log file in notepad from  ..\GFI\MailEssentials\AntiSpam\DebugLogs
   • This log is for the Header Checking Filter Module and corresponds to the Configuration > Anti-Spam > Anti Spam Filters > Header Checking in the interface and a number of the antispam2 tables in the config.mdb
3. Do a search for the Message ID from the dashboard or the email headers.
   • Note: The Message IDs have been removed from the example log files below
   • Note: The bolded lines are the important ones in the log files for determine what has happened and why

Email was allowed by the module:
 

Email was blocked by the module:
 

• "From field empty"
• "Email header contains a malformed MIME From: field"
• "Recipient list exceeds maximum threshold"
• "Email has different SMTP TO: and MIME TO: fields in the email addresses"
• "Domain does not exist - invalid domain passed"  OR "Domain does not exist
• "Number of numbers in MIME From exceeds maximum threshold"
• "Encoded IP"
• "Email contains remote images"
• "Embedded GIF"
• "Email contains attachment spam"
• "Email found in subject"
• "Character set not allowed" - This is set in the Language tab

• If any of these checks are blocking valid emails, the only options on the recipient end is to whitelist the sender or disable that check. These issues must be resolved by the sender.

Module is disabled: