mail is not shown in mailbox until 5 minutes

[fanofopenxchange]

Hallo!

I hope somebody can help me.
I have installed a new email server with postfix, cyrus etc.
I alos have a Openxchange with the imap plugin. Both work perfectly together.
Now the problem is when i get a mail, the mail is showing in the quickinfo loginscreen but i have to wait 5 minutes until the mail comes to the mailbox and i can read it.
Does anybody now what goes here wrong?
Sorry for my english i hobe it is good enought too describe this "error" clear enought!


Thank you for your help

[rolfpf]

Do you have any incoming filters on IMAP or outgoing filters on SMTP?

If they are not working correctly it can cause this sort of behaviour.