The prevalence of electronic mail over the traditional typed and mailed letter may leave a new generation not knowing how to sign a business letter. Regardless of how your correspondence is transmitted--either via the post office or email--some rules still apply.
How to Close
In a formal business letter, never close the correspondence with "Regards" or "Kind Regards." If the recipient's name is unknown, use "Yours faithfully." If you know the recipient's name, use "Yours Sincerely" or "Sincerely Yours." Do not use closings like "Love," "Always," "Warmly" or "Cheers," as they can be misunderstood and appear unprofessional.
Your handwritten signature (in the case of a mailed letter) should appear between the closing and your printed name. The space where you will sign should be four lines. In an email, your handwritten signature may be included as part of your electronic signature, in which case no spaces are needed. This automatic footnote signature should include your contact information, as if it were letterhead or stationery.
In a typed and mailed letter, the closing and signature should be either flush left in line with the left margin, or on the right in alignment with the address at the top of the page.