How do I block one person?
I've done this before, but don't remember how?
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Are you talking about a mail service?
You will have to contact your e-mail provider for help. https://support.mozilla.org/en-US/kb/problems-with-email-how-to-find-help
Or are you talking about Thunderbird? https://support.mozilla.org/en-US/products/thunderbird
Some e-mail providers have the option to sort incoming mail. Contact your e-mail provider for help.