The Lounge is rated Safe For Work. If you're about to post something inappropriate for a shared office environment, then don't post it. No ads, no abuse, and no programming questions. Trolling, (political, climate, religious or whatever) will result in your account being removed.
I do include greetings at least in the first exchanges of a mail thread. If the thread is highly technical and fast paced (i.e "Try X" "It behaves in this way", "Then it could be configuration Y", "Now it behaves that way", "OK I send you a patch" ...) then I drop the salutations after a couple of e-mails, and only if my interlocutor does the same otherwise I keep being as polite as I can be.
An e-mail is, IMO, the online equivalent of a memo. Do memos typically contain salutations?
This really surprises me due to your assumed age. The term 'Netiquette' started appearing back in the 1970's and there are actually entire sections dedicated to the e-mail formalities in several of my old Unix manuals/books.
I've always observed that the older generation uses a more formal style of communication. It's the later generations that uses a more informal communication style.
We did have Internet in universities during the 80s, and there was an (extremely expensive) dial up option as well. Dial up prices during the 90s dropped to the level that they were affordable by the average home user, which is when I first got online.
Israel wasn't always the Startup Nation...
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
I tend towards considering these greetings to be just a blurb, a waste of space. I use them, because they are expected. But it feels strange writing an email to "Dear Standard Oil Company, ..." - Exxon isn't "dear" to me. "Hi, Standard Oil,..." is a little too informal. In the old days, you could use terms like "Honorable Standard Oil" or "Most Revered Standard Oil, ..."
A middle-of-the-road level of being formal is "Sirs, ...", but in these #metoo times, you run the risk of being accused of sexual harassment if some lady happens to see the messagage and claim she is being kept out because she is female. So should I use "Sirs and Madams," even when I know that only two males will read the message, or do I have to know the sexes of all possible readers to decide on a salutation? Maybe I should go for "Madmen and Madams," ...
Must say it's nice driving for someone who died six years ago!
What I don't understand is why the police think they have the right to interfere with Gods biddings?
Anything that is unrelated to elephants is irrelephant Anonymous - The problem with quotes on the internet is that you can never tell if they're genuine Winston Churchill, 1944 - Never argue with a fool. Onlookers may not be able to tell the difference. Mark Twain