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?
Creative departments revolted and started using personal gmail account like this (first.last_company@gmail.com). And before you knew it confidential data was bleeding out of the organization.
It was a total DIY google apps. Shared folders for projects, funny photos, and everything else you might imagine.
I setup a google sheet with links to each creative teams google drive.
It was such an interesting evolution of workflow management that came from the bottom up.
It was especially interesting to see how non-technical people (designers, account people, etc) used the suite of google tools to self-organize into their own data ecosystem.
So the moral of the story here, kids, is dont use Lotus notes because the minions will revolt.
I Used Lotus Notes at three successive companies, from 1995 through 2010, excluding when I went to college. I went through this. If they're blocking pop/imap, there's nothing (good/worth doing) you can do.
My view is that Notes use is a symptom of much bigger underlying problems. No-one that has to send or receive email would ever make the decision to use it, so why are they in the position to make that decision?
Recently, we've had to renew a license on this software we are integrating into a product for a customer. Except we can't get a renewal because someone can't approve the order because they don't use Notes. Why is everything handled within this aging ecosystem? I have no clue. IBM really made something awful here.