Poor spelling: It could cost companies millions and could cost you an interview. Read, reread and have someone who can spell better than you check it again before sending off a correspondence with a potential employer.
Another quick hint: Do what they ask for! If the potential employer is asking you to title your email with a specific subject line, do it. It all shows how well you read, write and can follow directions–three things you’ll need to be able to do if you want to work.
(I shur hope their urn’t n-e speeling misstayks in heer. That wood probubly look reelly bad fur me.)
BBC News posted this article discussing the impact of poor grammar and spelling in the real world: Spelling Mistakes ‘cost millions’ in Lost Online Sales.