thinsol
Lot many proper mails are landing in Junk folder . There is no spam filter installed or enabled still it is landing in junk folder
Are you referring to the Junk folder in your email client or the junkmail folder in the IMAP folders on your sme server ?
If there is no spam filter enabled on your server, then it cannot be moving mail to thr IMAP junkmail folder.
I suspect it's your email client that is moving messges to the junk folder.
Note that on sme server the IMAP junk folder's name is junkmail, not Junk.