When uploading the emails to IMAp the folder structure is not retained and all mails get put straight into the INBOX. Can this be fixed?

User wants to archive duplicate emails:

Unfortunately, I also need double mails. For example I have a folder for invoices and one for the respective order. The invoice sent later is then once in the invoice folder and once in the order folder. There are also mails which concern several orders and which I attach as a copy to each order. Therefore the duplicates would also be important for me.

Allow user to archive everything and delete mails by date.

Add dropdown to archive button if the open archive is different from the one in the setup. Make entries for open and setup archive.

Moving mails to the trash is just too slow for Mail. Instead allow coloring of archived mails with AppleScript so that user can identify the mails:

tell application "Mail"
set theMessage to message 12 of mailbox "INBOX" of account id "DC2EFCDE-9FBE-48FF-A94D-13DB6ADCF788"
set background color of theMessage to none
end tell

When an attachment is attached twice as inline and as attachment then this is shown twice in the mail, but only once in the attachments. See screenshot and mail.

When selecting a day range this is a bit confusing because I can't see which date is 100 days away. Find a method to show this.

Thread for diagnosis is okay. But don't use app.sleepcurrentthread to check on the thread. Make a timer and check there.

On El Capitan the dialogs go away nicely. But on High Sierra the dialogs aren't hidden quickly.

There are 2 options for sending out mails for the scheduler. "always" and "on error". Currently always is default. Change to on error.