How to filter subjects with UTF-Encoding

Hello everyone,

I am facing this problem: I have a large list of keywords that I search for in the subject and then block; however, mails with a subject like this one still come through:

Subject: =?UTF-8?B?Umllc2lnZSBQcmVpc3JlZHVrdGlvbjogV2Vya3N0YXR0d2FnZW4gZsO8ciAyNDksLSBzdGF0dCA2OTksLSBFdXJvIQ==?= BPg/PTLut/NPPFikQD0wRodnrM4V4+vTpVJXUbfcKP/vGilPZVTyBnWxvsO K4eKHDI1+5oTX3LxlRfXIOBFeNtFjHgRa+tcaWK918OEi8HuavJ6c/fbDVTvgYpKFWUxhs0JBvQl 94PYWFQjmpmFGxKviKY=

this then resolves in plain text...

Read more