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Why does Mozilla send two e-mail every time I send an e-mail?

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Every time I send an e-mail, I see two of the same e-mail in my sent box. Why?

Also why does Mozilla delete my e-mails off the main server automatically? I like to do it manually.

Every time I send an e-mail, I see two of the same e-mail in my sent box. Why? Also why does Mozilla delete my e-mails off the main server automatically? I like to do it manually.

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Is it really sending it twice or are you just seeing it two times in the sent folder? Some providers like gmail place a copy in your sent folder already so you need to go into Thunderbird settings and tell it not to do it again. Then you will only see if it once in the folder.