Hi, I create a public folder and mail enable it. I can send email to it internally but there is a huge delay before i can send external mail to it. Is there something i need to do?

Need more information. Exchange version and configuration (2003, 2007/10, Edge servers?). What do the NDR's say whey you try to email the folders?

Sorry, It is exchange 2007, i have 1 edge server, 1 hub/cas server and 1 mailbox server. The NDR says This is an automatically generated Delivery Status Notification.Delivery to the following recipients failed. Reporting-MTA: dns;snt0-omc1-s3.snt0.hotmail.comReceived-From-MTA: dns;SNT112-W15Arrival-Date: Tue, 30 Mar 2010 08:26:13 -0700 Final-Recipient: rfc822;email@domain.com Action: failedStatus: 5.1.1Diagnostic-Code: smtp;550 5.1.1 User unknown

Does the NDR say why delivery failed, or give you a delivery failure code?

I have tried Start-EdgeSynchronization (run as admin) and Test-EdgeSynchronization -VerifyRecipient both are successful

How long does it take before they start working?

last time it was longer than 5 hours

looks like rebooting the edge has solved the problem for now

Configuration data is synchronized to ADAM once every hour, and recipient data is synchronized to ADAM once every four hours. You cannot modify the synchronization intervals. Howerver, you can use the Start-EdgeSynchronization cmdlet to force synchronization to start immediately. You can also write a script to schedule to run Start-EdgeSynchronization at your desired time intervals.