Call Out Line/Special Wording is available, but not required
Facing Identification Mark
The facing identification mark (FIM) serves to orient and separate certain types of First-Class Mail during the facing-canceling process.
The Facing Identification Mark barcode is designated by the USPS to assist in automatically processing mail. These are the vertical bars located to the left of the stamp on many preprinted envelopes.
Printed indicia, instead of an adhesive postage stamp or meter stamp that shows postage prepayment by an authorized mailer. You can apply for a permit with the United States Postal Service here.
Postage indica designation on male denotes postage payment through the United States Postal Services, requiring a permit number through them.
These lines of text will inform the United States Postal Service of additional requests in the case that the mail is undeliverable. When these services are used, there is an additional fee to the USPS, information on the fees can be found here.
Ancillary service endorsements are used by mailers to request an addressee's new address and to provide the USPS with instructions on how to handle undeliverable-as-addressed pieces. They are the same for each class of male, though there are different costs associated with the various services. (See usps.com for postage rates).