What is the typical number of lines separating the inside address and the salutation in a formal letter?

In formal letter writing, the typical format dictates that there are usually two blank lines separating the inside address and the salutation. This spacing provides a clear distinction between the recipient's information and the greeting, helping to maintain a professional appearance. The use of two lines ensures that the letter remains uncluttered and allows for easy readability, which is critical in formal communication.

While some variations exist depending on personal or organizational style, the two-line separation has become the standard in many contexts, aligning with traditional formatting guidelines in business communication. This practice enhances clarity and professionalism, making the correspondence more effective.