Create a filter for any message where the subject is blank
When a message with no subject is received in my inbox, I want to set a filter to move it to another folder. There appears to be no way to create a 'subject contains' with the text area left blank. The filter will not work on a test message.
Keazen oplossing
Perhaps this will help http://www.dslreports.com/forum/r16325331-Thunderbird-SPAM-filter-for-a-blank-subject-line
Otherwise this will probably do it for you, but java script knowledge is assumed https://addons.mozilla.org/en-US/thunderbird/addon/filtaquilla/
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Keazen oplossing
Perhaps this will help http://www.dslreports.com/forum/r16325331-Thunderbird-SPAM-filter-for-a-blank-subject-line
Otherwise this will probably do it for you, but java script knowledge is assumed https://addons.mozilla.org/en-US/thunderbird/addon/filtaquilla/