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Hello, I am using thunderbird but this morning when I opened my sent post it looks strange as it has been sent to someone else as well. There is an arrow

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Good morning,

I have questions about my sent items, when I opened today my e-mail on the sent items before the name of the person that received the mail there is an arrow. Why? Before that such arrow did not appear.

Good morning, I have questions about my sent items, when I opened today my e-mail on the sent items before the name of the person that received the mail there is an arrow. Why? Before that such arrow did not appear.

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