I used to work at EnormousCorp and internally there was fetchnotes, a fetchmail-like command line tool for situations exactly like yours. A bit of Googling seem

I used to work at EnormousCorp and internally there was fetchnotes, a fetchmail-like command line tool for situations exactly like yours. A bit of Googling seems to only show mentions of it here and there but no downloads or links to source so I guess it never made it to the outside world, which is unfortunate. Lotus Notes 8.0 and later are based on Eclipse though, so perhaps with a little bit of effort one of the Vim or Emacs plugins might possibly work for it?