Warriors – good question.
PLEASE! Send a letter of introduction. It makes a difference!

All your mental anxieties about it are over-blown.
As long as the formatting is clean (NOT perfect), the letter will be appreciated.

Attached find a few templates. Rules for an effective letter of introduction:
– message: “I am a humble servant of YOUR organization, Sir/Ma’am…”
– ONE-page!
– Read it before you send it! Re-read it six times before you push “SEND.” That shouldn’t take long, remember it’s only one-page.