Lookup list for receipients. Can it be cleaned out?

[lakebandit]

When creating a new message, typing in the first few letters of a receipient's name the list contains some odd entries. A colleague may have their normal email address listed but also has one with xo:/organization= . If I switch over to the normal address book app the entry doesn't show up for that person. I am tied to the company exchange server so I suspect I am getting it from there. Others with Iphones setup in a similar way don't have this issue.

Any way to clean out that "quick type" lookup list when selecting receipients?

Thanks,
Dan