There is no common theme to these and they go back over three weeks of using a variety of different computers and ISPs. The majority of then are Lj comment replies.
It may be that I simply did not notice that they hadn't sent as the sent/unsent message is on the small side, but that still seems an awful lot.
ANy ideas? Should I switch to another webamil? I hope not as I really like the searchability of gmail.