Load bug 17325. Notice how the last email address in the CC field is truncated (missing @netscape.com). Every time I try to submit a change to this bug, I get an error saying that 'sfraser' is not a valid username. When I correct that and resubmit, I then get the 'Mid-air collision detected' page.
I can't reproduce this. I seem to remember some discussion somewhere that this was a browser bug, and Mac-only or something like that.
Verif this is a browser bug. Bug #42851 should now work around this anyway.
I'll add my own verification and note which browser it is (for anyone else who runs into this). This is a bug in Netscape Communicator 4.7 on the Mac. Single-line text input boxes appear to be limited to 1024 characters. If it goes over that, it gets truncated. As far as the CC list goes, this is irrelevant now as it's handled in a list box instead of a single-line text input. FWIW, iCab 2.0 (Mac) has the same bug.
moving to Bugzilla product reassign to default owner/qa for INVALID/WONTFIX/WORKSFORME/DUPLICATE