We are experiencing a strange phenomenon where people who communicate with us regularly are not able to send emails with attachments. regular emails with no attachments before or after they attempt the attachment come through fine, but the mail with the attachment generates a delay message and ultimately an NDR saying the connection timed out or some such thing.
Sometimes the same party can send attachments and they come through ok.
We are running Exchange 2003 standard on a Server 2003 Enterprise machine. The Exchange DB is 14.3G in size.
Thanks for looking.