What the Founder’s Email Address Says About Your Startup

That’s actually a recurring question I have, given that we have a fairly long (21 chars) domain name: should we stick to first.last@company.com (which is fine but long to type), move to first names only (with the obvious question of what to do once you have 2 employees with the same first name), or purchase a shorter domain name as an alias (which means a lot of changes)? Any thoughts?