I am having the same issue with this error message. It seems to have just started recently too. And while we dont use squirrle that much, I cant discount that it might be the cause as I have both enabled for users to use.
Zeus
Code:
Incorrect owner on mailbox file /home/wwwfree/mail (32103:12) ... fixing (32103:32105)
Incorrect mode on mailbox file /home/crmmgr/mail/dealereprocess.com/inboundleads/.processed/courierimapkeywords/.4002568.1200768988.M173795P32716V0000000000000308I005C0C27_0.zeus.almightyservices.com,S=2575 (0644) ... fixing (0660)
Incorrect mode on mailbox file /home/crmmgr/mail/dealereprocess.com/inboundleads/.processed/courierimapkeywords/.4002565.1200768988.M173795P32716V0000000000000308I005C0C27_0.zeus.almightyservices.com,S=2575 (0644) ... fixing (0660)
Incorrect mode on mailbox file /home/crmmgr/mail/dealereprocess.com/inboundleads/.processed/cur/1200854522.M337361P22019V0000000000000308I005C0D63_0.zeus.almightyservices.com,S=2322:2,S (0644) ... fixing (0660)