What position must the folded edge of a letter-size folded self-mailer be aligned with?

The folded edge of a letter-size folded self-mailer must be aligned at the bottom, parallel to the longest dimension of the mailer. This alignment is essential to ensure that the mailer is prepared correctly for automatic processing and handling by postal services. When the folded edge is positioned at the bottom, it allows for easier stacking and minimizes the risk of the mailer getting caught or jammed in sorting machines. Furthermore, this orientation facilitates proper addressing and ensures that any information on the mailer, such as return addresses or postage, is positioned correctly for visibility and compliance with postal regulations.

In a folded self-mailer, the alignment also helps ensure that the mailer opens properly when being handled. Positioning the fold in this manner maintains a consistent handling format that postal workers and machines are accustomed to, improving the efficiency of the mailing process.