Summarize the following:
Discuss when and how you will contact the employer to follow up on the status of your application. Give your contact information, i.e., name, email address, phone number, and availability as well. You could write: I am reachable by phone or email. If you cannot get back to me, I will call you [next Monday]. It is polite to thank the reader for taking the time to review your materials. End with a cordial closing, such as “sincerely.” If you have spoken to the person via phone or in person previously, you might use a greeting like “best regards.” Do not use “Thanks” or simply “Best” as closings in formal correspondence. Sign your full name, e.g. Joanna Smith rather than just Joanna. Do not attach your resume to an unsolicited internship email. Unless the company is actively seeking interns, they may not want to open your attached copy, especially if they have a workplace policy about attachments. If the posting asked for a resume, attach your document as a PDF (as opposed to a Word document, where the formatting may be lost/altered when opened on a different system). Some employers may specify that they do not open email attachments. If so, include your cover letter and resume in the body of the email. Make sure to space them apart to make it easier for the employer to distinguish each document. If you have not heard back from the organization, email them again – or, preferably, call them. You could write: Dear Dr. Hansen, my name is [name] and I am following up on an email I sent you last week about a [fall] internship. I would appreciate the opportunity to discuss the position. Thank you. Sincerely, Joanna Smith.

Summary:
State when you will be in contact. Close the email. Evaluate attachments. Follow up as promised.