I’ve just imported 72,000 e-mail messages (1992 - current) into EagleFlier to see how it would handle that kind of volume. It works great!
A small proportion of these messages have ended up over the years with bogus dates or – very occasionally – with other problems. In many cases the internet headers are clear, such that I could fix these messages by hand, if I were allowed to edit them in the Record Viewer; unfortunately, I discovered after importing everything and merging mail boxes that I can not do this.
Is this ability on the to-do list for the future, or is it just too anathema to the idea of an archive? (I realize I could probably edit the mbox by hand, but it’s almost 1GB in size, and I haven’t any idea how the messages are organized within it…)