First impressions are always important even in correspondence.
Do create a custom electronic signature for yourself Just as it is an accepted custom include a signature with written forms of communication, it is accepted custom to have an electronic signature on email and other forms of electronic communication. One, it signals that the letter is done. In this sense the electronic signature is analogous to a written signature. In this sense the electronic signature serves the same purpose as paper letterhead. Just as it is customary in that form of communication to add a brief description of the subject of the memo, it is equally customary to complete the subject line of an email message for the same purpose.