I applied for a job on yahoo.hotjobs last night. But, reviewing the ad for the job, found an email address it suggests I send my resume to…should I send my resume to the email address, even though I’ve already applied on the site?

I need to send out an email to all my co-workers (only been with the company for 2 1/2 months so not everyone knows me) letting them know that I have changed my name (and email has changed) due to my recent marriage. What should I write? Thanks!!
I was told by my boss to send out a mass email, otherwise I would not do so…which is why I really have no clue what to write