mail.app doesn't sync mails
Hi,
I have some mails in my mail server which is not synchronising with Mail.app. When I check mail through web mail, I can see all emails, but some of them don't appear in Mail.app.
My email account is IMAP and I checked setting in Mail.app it was also sets to IMAP.
When I check same mailbox from my iPhone, I can see all email like webmail. Only my MacAir have this problem.
Any suggestion!!!!!???????
MacBook Air (13-inch Mid 2011), OS X Yosemite (10.10.5)