ok, so i don't know if this refusal to broadcast posts to my email archive is unique to me or not, but that's a workaround.

1) post the link like this:

h t t p s : / / w w w . n c b i . n l m . n i h . g o v / p m c / a r t i c l e s / P M C 3 6 6 4 9 1 3 /

....that is, with spaces in between the letters, so the script doesn't know it's a hyperlink.

2) edit the post so it's correct, after.

that way, you can get your email archive more or less in tact.