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Thunderbird 68.11.0 (32-Bit), WIN10, no problems since 10 month, but now...

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Thunderbird: Big problem since one week all older mails have been deleted from inbox and are gone for good! Now Thunderbird continues to delete! All old mails older than 7-8 days! I do not understand it. There is no deletion activation for the account! How can this suddenly happen as if by magic. IMAP is used and has worked for months without any problems. Did not make any changes, all ADD-ons are off. No deletion stop possible. Like cancer goes on... What is to do?????? No antivirus-programms, only Defender at WIN10, no Problems

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Itis IMAP so the server may now have some form of auto deletion / auto archiving rules. If you are using a phone it might be the phone is auto deleting mails after 7 days and that is synchronizing to Thunderbird copy of the email.

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Great, thanks for the hint with IMAP! I only use the GMX app on my mobile. I never want to delete the incoming mails on my PC synchronized and without ask me for delet! Thats horror!

How can I prevent the synchronisation "Delete" on the PC/Thunderbird? Setting? Thank you for the tip!!!!! It is too much work for me to copy the important mails or to drag them into a separate folder. You can forget that sometimes... and then everything is lost again :-(

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