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How do I find an email that seems to have been blocked even though it is legitimate?

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A friend sent me an email that arrived in my smartphone, but I want to get it on my computer. It never came through. How do I review blocked emails?

A friend sent me an email that arrived in my smartphone, but I want to get it on my computer. It never came through. How do I review blocked emails?

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Thunderbird does not block messages. Is the message still in your inbox on the providers server? Thunderbird downloads what is in the Inbox.

Are you using IMAP or POP?