I would have agreed with Reddlefty but there is something fishy about the size of those emails. For sure oyu should check your vs1\badmail folder and see how many items are in there on a daily basis. Then go here and make sure you are/were not a relay:
http://www.dnsstuff.com
Test it yourself...
2034 is not a very common problem at all. Never seen it. Since you are using OWA on 5.5 and it's such an odd error, check your logs for license errors and then check your license manager for unlicensed activity. I have a feeling you may find it there.
If not, refer to...
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