How To Write A Letter With Attn . Begin the subject line with attn. Method 1adding attn to an email. About Attention Line in a Business Letter Letters Business letter from www.pinterest.com In some cases, such as a job application, you may only have a generic email for a company, but want to gain the attention of a particular person or department. Mention the issue in clear words; The united states postal service encourages senders to not use “attn” when addressing a package, but rather to simply write the specific recipient’s name above the organization’s name.