Just have encounter some problem here, we are testing the server in for few months now.
But there is some problem just have after have it upgrade from4.54 to 4.56
I can send the email from email client like outlook outlook express with IMAP fine.
But when using the web interface, there will be Critical error message
the same email can be send in other email client but just not on the web mail.
Any one can suggest a solution.