HiLet me try and explain the problem.I have 2 types of email user, 1 thats on the exchange server and 1 thats not. the reason for this is that a lot of our users use apple macintosh computers and we have a Kerio Mailserver. Mail is delivered to both servers by our isp.Let saymark.reynard@silvercloud.co.uk is a Domain User with an exchange mailbox.claire.reynard@silvercloud.co.uk is not a domain user, and doesn't have an exchange mailbox.The ProblemMark can send emails to everyone outside the domain and to other users with an exchange mailbox, but cannot send them to a user like claire. I am assuming that this is because the silvercloud.co.uk domain is the local domain according to the AD or Exchange Server.I need a way of forwarding mail to unresolved addresses @silvercloud.co.uk, ie anyone who is not a domain user or have an exchange mailbox.If I could forward them to another SMTP server, hence Kerio, this would be great.Hope this makes sense.Mark

Hi Mark,Which version of Exchange do you use?Below articles explain you how to configure smtp address space sharing with other email systemin Exchange.References:How to share an SMTP address space in Exchange 2000 Server or in Exchange Server 2003http://support.microsoft.com/kb/321721How to Configure Exchange 2007 to Route Messages for a Shared Address Spacehttp://technet.microsoft.com/en-us/library/bb676395.aspxAmit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com

2007 standard

This should help you...How to Configure Exchange 2007 to Route Messages for a Shared Address Spacehttp://technet.microsoft.com/en-us/library/bb676395.aspx Amit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com

All sorted, works a treat, many thanks for your help, much appreciatedHave a good dayMark

Glad to know, you are welcome!!:) Amit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com