In my excitement, I composed an email and clicked Send, only to realize that I had forgotten to address it first! This was brought to my attention when I received an email from the mailer daemon informing me of the fact.
I think the user experience would be improved if instead, webmail either:
(a) dimmed the Send button entirely in the absence of an address
(b) responded to a click of the Send button by moving the focus to the To field and then highlighting it to direct the user’s attention there.
I’m thinking (b) is probably the better approach, but either would be an improvement.
Thanks for reading!