FEAT: Block sender / blocklist

[andrinoff]

Is your feature request related to a problem?

There's no way to suppress mail from a specific sender.

Describe the solution you'd like

Maintain a blocklist; messages from blocked senders are auto-filed/hidden.

Describe alternatives you've considered

Manual deletion each time.

Additional context

Config-backed list; apply on fetch in fetcher/dispatch.go.

[floatpanebot]

Thanks for the suggestion!

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