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Why are we suddenly receiving two copies of every email, and how do we fix it?

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Two days ago, we started receiving two copies of every email that came into our inbox. Is there some setting that will limit the messages coming in so that we only receive one copy of each message?

Two days ago, we started receiving two copies of every email that came into our inbox. Is there some setting that will limit the messages coming in so that we only receive one copy of each message?

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Firefox is simply a web browser, and cannot modify your email. If you are having this problem with Thunderbird, please go here: https://support.mozilla.org/en-US/questions/thunderbird

If you are using Gmail, please go to Google's product forums: https://productforums.google.com/forum/#!forum/gmail