Final answer:
Certificates are not typically mailed out on federal holidays because these are non-working days for government postal services and thus, certified mail services do not operate.
Step-by-step explanation:
Certificates are not typically mailed out on federal holidays because these are non-working days for government postal services and thus, certified mail services do not operate. The question "Do we mail out certificates on federal holidays?" is related to the operation of mailing services during federal holidays. Typically, certified mail services, such as those provided by government postal services, do not operate on federal holidays. These holidays are considered non-working days, meaning that regular postal services, including the dispatch and delivery of certified mail, are not available.