I thought this was more related to some sort of corruption on the file system. Also the doveadm does not seem to be able to fix it. I never created this 'foldertest17485243507278' so I guessed it is maybe something dovecot found. Some stray mailbox it detected. Nobody every seen these automatically appear?
I don't think much help will be posting a conf as it has probably 95% irrelevant data.
We can't help until you post your config, and give us a bit more context here. What version of dovecot are you using? What do the log files show? What OS are you running on? What is your backend mailbox storage?
Giving us the output of:
doveconf -NIs a good first start. Basically, you're just saying "Broke. Fix!" and that doesn't do much.
John
doveadm force-resync -u $account INBOX
doveadm(): Warning: fscking index file /.../index/storage/dovecot.map.index doveadm(): Warning: mdbox /.../mdbox/storage: rebuilding indexes doveadm(): Error: Couldn't open mailbox 'foldertest1751045732429': Mailbox doesn't exist: foldertest1751045732429 doveadm(): Error: Couldn't open mailbox 'foldertest1751045732429/foldertest': Mailbox doesn't exist: foldertest1751045732429/foldertest doveadm(): Error: Couldn't open mailbox 'foldertest17485243507278': Mailbox doesn't exist: foldertest17485243507278 doveadm(): Error: Couldn't open mailbox 'foldertest17485243507278/foldertest': Mailbox doesn't exist: foldertest17485243507278/foldertest doveadm(): Error: Couldn't open mailbox 'Trash/test': Mailbox doesn't exist: Trash/test doveadm(): Error: Couldn't open mailbox 'INBOX/test-files': Mailbox doesn't exist: INBOX/test-files doveadm(): Warning: fscking index file /.../index/storage/dovecot.map.index
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