Make it easier to filter messages

[m_h]

Please add some functionality to filter messages we search for easier. By now, it's extremely hard to find anything using filters such as "from:", "to:", "subject:" or file name/extension of an attachment with a specific value, and even harder when we want to use regex. Anytime I search for a specific message, I know that in the end I'll have to look over tons of messages one by one. Maybe allowing users to add simple tags to messages would also be helpful.

[Jon]

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[MattAuSupport]

Perhaps use the addon that extends filtering to include regex.  https://addons.thunderbird.net/en-US/thunderbird/addon/filtaquilla/