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Why do i get 2 copies of outgoing mails in my sent folder

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I have used one e-mail account (eclipse.co.uk) for years. I recently added two more. With one (Hotmail.co.uk) whenever I send a message I get two copies in the 'Sent' folder. This does not happen with the other accounts. On the third account (plus.com) some of the incoming messages appear twice in the inbox. This doesn't happen on the other accounts

I have used one e-mail account (eclipse.co.uk) for years. I recently added two more. With one (Hotmail.co.uk) whenever I send a message I get two copies in the 'Sent' folder. This does not happen with the other accounts. On the third account (plus.com) some of the incoming messages appear twice in the inbox. This doesn't happen on the other accounts

All Replies (3)

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it could be something to do with setting up aliases or syncing accounts.

What it is not is a Firefox problem.

Firefox as a browser merely enables you to view your webmail site. Contact them about your problem.

You may like to post back here with the link to the answer when you find it as it could help others.

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I made a big mistake ! I am using Thunderbird Mail not Firefox. I took your link and found an answer to the two messages in the Sent folder but didn't see anything about duplicate incoming messages. I recently transferred to Plusnet. On the first day 5 messages to me on my new address, all from them, only appeared once. Subsequently all messages from them appear twice. Messages I have sent to myself only appear once. Thanks for your help - sorry about confusing the original request for help.

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moving to the Thunderbird support queue