I am trying to write a filter to send all email with non-ascii and/or formatted characters to a SPAM folder. To do this, the filter has to recognize the string '=?UTF-8?B' in either the From header and/or the Subject header. I tried From and Subject conditions but they dont seem to work. I am assumed they worked on raw header but it may be they see the =? and then encode it or skip it altogether. I am looking at the "String" filter condition but don't know if this will work since I cannot find ANY documentation on filters other than "Sender/From" - which appears all over. Anyone else trying to get rid of these advertising spammers ? None of my normal emails (bank, comcast, verizon, friends, etc) have either of these headers encoded. Only adverts. Does anyone have current documentation for the filter conditions (e.g., without deprecated Regex rule) ?
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