Hoople - 4:18 am on Jul 19, 2010 (gmt 0)
Is the image a GIF? Many large companies blocked GIF's in general or animated GIFs when they became a viri ditribution container recently (late '08?)
Barracuda's are a hardware IP filtering appliance that operate at the edge of larger customer's networks. They work from a central SPAM sender database initially but do have a local user whitelisting mechanism. To verify if you are in the central database [barracudacentral.org ]
Messages with high spam scores are automatically deleted on the Barracuda server. They ARE NOT sent to the user for whitelisting.
Messages with moderate-to-high spam scores are sent to a Quarantine Inbox on the Barracuda server. Users receive an email notifying them that they have these messages in their Quarantine Inbox.
Messages with low-to-moderate spam scores are tagged as suspected spam delivered to their Inbox. Outlook newer versions will move these to the 'Junk Mail' folder. With no changes on installation this feature is enabled by default in Outlook 2002 (Office XP) and newer.
There are tools to check a message's SPAM grade, you may wish to investigate them and tune your messages based on the tools recommendation(s). A few are listed here [emailexpert.org ]