It would depend on a few things. 1) Are you in mixed mode environment? If so ensure that the LegacyExchangeDN is configured correctly and there is no space at the end. 2) Are you using X400? If so ensure TextEncodedOrAddresses is exactly the same as Proxy Address. 3) Are you routing internally or externally? 4) Where does the message get stuck? What is the transport that it gets stuck on? Mark Shevill IMG Messaging Deputy Team Leader Shell Information Technology International Limited Rowlandsway, Wythenshawe, Manchester M22 5SB, United Kingdom Tel: +44 161 935 7152 Email: Mark.M.Shevill@xxxxxxxxxxxx Internet: http://www.shell.com -----Original Message----- From: tracy_strub@xxxxxxx [mailto:tracy_strub@xxxxxxx] Sent: 09 August 2002 21:31 To: [ExchangeList] Subject: [exchangelist] troubleshooting non-delivery http://www.MSExchange.org/ Hi there I have one host address that in the past few days has been getting stuck in the queue with 'unknown host'. From the Exchange server I have no problem sending a message telnetting to their mailserver; they can send messages into our system, but if we try and reply, back into the queue and nothing goes out. As I say, it is only one domain, but if I can telnet into it, shouldn't it resolve this address? Thanks TS ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: Mark.Shevill@xxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')