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Error: some messages are disappearing from the Webmail
Please note that there are some options in Outlook and similar which alllow you to specify that messages should not be removed when you download them, by keeping them for a limited period of time (10 days for example). This isn't recommended; This is defined in the software directly, and doesn't depend upon Infomaniak.
If the email software is set in IMAP then it functions differently, however there are certain options in email clients and our Webmail that allow email to be sorted automatically, scheduled for deletion, using automatic rules, etc.
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