Spammers obfuscate the subject line to pass through postfix's header_checks. Is there a way to identify such obfuscation while allowing legitimate messages through? Here's an example subject line: =?UTF-8?B?SW1wcm92ZSBZb3VyIFNleHVhbCBQZXJmb3JtYW5jZSBJbnN0YW50bHkuIDQ=?= which alpine displays as plain text. Rich