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e-mail displaying strange text

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Dear Mozilla support,

Since the upgrading of the system, I am getting weird text in messages received with attachment files. Other people around me are facing the same issues. When the sender is attaching a file, Thunderbird slows down but eventually sends the e-mail. When the e-mail is sent, strange text appears at the bottom such as the attached examples. That leads in slowing down of Thunderbird too.

I contacted our webmail server (Gandi) and everything is in order on their side. They recommended contacting the mailbox system, i.e. Thunderbird. Is there anything that can be done to fix that?

Dear Mozilla support, Since the upgrading of the system, I am getting weird text in messages received with attachment files. Other people around me are facing the same issues. When the sender is attaching a file, Thunderbird slows down but eventually sends the e-mail. When the e-mail is sent, strange text appears at the bottom such as the attached examples. That leads in slowing down of Thunderbird too. I contacted our webmail server (Gandi) and everything is in order on their side. They recommended contacting the mailbox system, i.e. Thunderbird. Is there anything that can be done to fix that?

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Dear Mozilla support,

Since the upgrading of the system, I am getting weird text in messages received with attachment files. Other people around me are facing the same issues. When the sender is attaching a file, Thunderbird slows down but eventually sends the e-mail. When the e-mail is sent, strange text appears at the bottom such as the attached examples. That leads in slowing down of Thunderbird too.

I contacted our webmail server (Gandi) and everything is in order on their side. They recommended contacting the mailbox system, i.e. Thunderbird. Is there anything that can be done to fix that?

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Dear Mozilla support,

The issue is still happening with no solutions. Could you please try to fix this?

Thanks.