Just a guess, how is the Outlook Express configured? Is it possible the outgoing smtp point to another smtp server other than Exchange, while incoming point to Exchange. Then for Exchange 5.5 is it possible the IMS set the max size for delivery to a very low value? That will explain why Outlook Express can send attachment while Outlook cannot. I can be wrong, just guessing. -----Original Message----- From: Meral KESKINER [mailto:MeralK@xxxxxxxxxxxx] Sent: Wednesday, December 18, 2002 5:55 PM To: [ExchangeList] Subject: RE: [exchangelist] Re: Help!!! http://www.MSExchange.org/ This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible.