This e-mail responds to a classified ad that asks for applicants to respond via e-mail.
In response to your classified ad in the <publication name>, I am sending you this e-mail to put myself in the running for the position of <available position>. I think that once you see my resume, you'll agree that I am the most qualified individual for the position. I graduated from <your school> in <year of graduation> with a major in <major or certificate subject>. I have spent the last <years in field> years working in <your field> for such companies as <previous employer>. In that time I have developed a wide range of skills, as well as the good judgment that only comes with experience. That is why I think I would be an excellent fit for <company you're applying to>.
I have attached my resume to this e-mail. If for some reason you are not able to download it, please let me know and I will send you a hard copy immediately. Either way, I feel confident that you will find my qualifications worthy of an interview. I look forward to hearing from you. Thank you.