When a point is irrlevant or of no consequence, it's a moot point, not a mute point.
The word "an", not the word "a" should be used when the word following it has a vowel sound. You don't send a e-mail, you send an e-mail.
You use the words "and I" if the phrase in question is in the subject, but you use "and me" if it's in the predicate.
The comma was invented to be used, not to be ignored or abused. The comma is your friend: use it as intended.
The word "waranty" and "warantee" do not mean the same thing. The thing you buy is a warranty, with a "y", and once you have bought it, you then become the warantee. With a double "e".
My being on a mailing list with you does not make me your friend. It is our being friends that makes me your friend. So don't use the word "friend" unless you truly believe that your recipients all are your friends.
Your dog did not write your e-mail. Your dog did not know you were writing the e-mail, and would not care if he or she did know. Your dog does not even know what an e-mail is, its purpose, or its consequences, so signing your dog's name to your message is an untruth.
If you are a ham radio operator, you are part of a minority. You are probably one of maybe 0.5% of the population of the planet who has any inkling of what "73" means. Don't assume your recipients are also in that 0.5 percentile.
Do you not see the irony in cluttering up the list members' e-mail boxes telling them how tired you are of people cluttering up your e-mail box?