Users take photos using their iPhones, then try to send these by e-mail. The iPhone gives its "whoosh" sound indicating that the message has been sent, but it seems to disappear. The recipient gets nothing, and the message doesn't appear in the sender's "Sent Items" folder or anywhere in the iPhone. This is affecting all users. They can send other e-mails OK.
All using iPhone 4 16Gb
GroupWise 8.0.1 on SLES 10 SP3
DataSync 1.1 (I think) on SLES 11 SP1