We are using Exchaneg 5.5 on NT4 and ahve a strange problem with some messages. We can send a message to a individual user on the internet, but when I try sending the same message to a list of users including the user that I was able to send individually, we get the error message below 'xx@xxxxxxxxxxxxxx' on 15/09/2003 09:21 The maximum time for delivering the message expired The MTS-ID of the original message is: c=GB;a= ;p=our org;l=servername-030915082045Z-147415 MSEXCH:MSExchangeMTA:sitename:servername I have tried to stop and restart the MTA on the home server of the user and all IMC's but the problem still persists. any ideas