4.4.7 NDR's on sent email - messages remain in STMP queue until expiry

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Hi

Using SBS 2003 SP2 with up-to-date Exchange (reported version 6.5.7638.1).
Recently, we have had problems sending other than small (<1MB) attachments
to certain domains. The sender gets a 4.4.7 delay report and eventually
(after 2 days) a failure report. It makes no difference whether the email is
sent via DNS or via our ISP (smarthost). The message sits in the outgoing
queue and is active for a long time. Sometimes the message disappears from
the queue but then returns.

Initially, we thought it was a problem with anti-spam software on the
receiving servers. It seemed to affect large PDF files but


.

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