America’s foremost etiquette columnist Judith Martin, aka Miss Manners, has partnered with her son, executive Nicholas Ivor Martin, for her seventeenth book, Miss Manners Minds Your Business. As technologies have advanced and social mores have shifted, generational gaps have widened and business manners have all but expired.
The word 'etiquette' reminds me of vicarage ladies discussing which way their pinkies ought to point when holding a tea-cup, but I use the word here with respect to the problem of friends who don't, can't or won't, respond.
I don't email much, and typically my 'you have mail' box may have anything between zero and three new emails each morning. I know people who apparently receive as many as 80 a day, excluding advertising! (How such a phenomenon occurs I'm not sure. They must be very talkative.)