that sounds right. and yes, very good stuff! i remember thinking at the time "hah. this is built with real computer science!". and well, at the time, it was the only thing that worked for large mail spools.

i also think it was the first support for sasl(?) encryption upgrades for legacy text/tcp mail protocols

also, fun sidebar: indices vs. indexes, both are apparently valid english... but it seems computer people have adopted the latter almost exclusively. never noticed it before...