thanks the culprit was /var/spool/clientmqueue deleted it and now only 15% inodes are used.
Funny that disk analyzer didn’t catch that.
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That directory holds mail to be processed by sendmail. It I would make a guess, some of your cronjobs is creating the mail messages. If new files shows up in that directory, you can read the file (using cat or less, for example) to see what it was all about.
Sending email from system daemons was a good idea some 30 years ago, but today not so much.
My guess could be wrong, however.
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