"The single biggest problem in communication is the illusion that it has taken place."
--George Bernard Shaw
Shaw's quote is #1 in my personal list of communication "myths"; that somehow because I said it, wrote it, and/or sent it-I've actually communicated successfully.
Of everything you receive in a day-how much of it do you do anything about? How much of it is "spamed!"
#2: because it was sent, it's been read
When will you get around to reading what's in today's "in-box?" How much of it will you delete without reading it at all?
#3: longer is better
It may be-if "longer" means you've captivated my attention and I want to keep reading. If not, length is of no consequence except to the author!
There's a corollary myth that says, "I've got the space-might as well fill it up!"
#4: shorter is better
Often shorter IS better-if you only need a few words to deliver your message. The truth is, longer messages, well written, and in the appropriate media, often draw more response.
#5: any effort to communicate is better than nothing
You might want to rethink your premise. You may not get a second chance.
If "to communicate" is the act of transmitting information; a thought, or a feeling so that it's satisfactorily received and understood-consider just how well you're doing! It could be the difference between being ignored, or getting the results for which you'd hoped.