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Please note that even if you allow a specific attachment type (i.e. zip attachments) by not entering the file type in Block/Accept > Attachment Blocking, the virus scanner on your Barracuda Spam Firewall will still scan the attachment and block as necessary. You can confirm you currently have virus scanning enabled by navigating to Basic > Virus Scanning. Detected viruses will not be quarantined or delivered to the intended recipient - even if the message has been whitelisted by a Block/Accept filter.
All messages, except those from whitelisted senders, go through attachment filtering. From the BLOCK/ACCEPT > Attachment Filters page you can choose to take certain actions with inbound and/or outbound messages if they contain attachments with certain filename patterns, file types, MIME types, or password protected archives. Actions you can take with inbound messages include block or quarantine. Actions you can take with outbound messages include block, quarantine, encrypt or redirect.
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