po prostu

titled documents/letters/correspondence

być może 'headed' zamiast 'titled' także może być użyte

A form letter is a letter written from a template, rather than being specially composed for a specific recipient. The most general kind of form letter consists of one or more regions of boilerplate text interspersed with one or more substitution placeholders.

Although form letters are generally intended for a wide audience, many form letters include stylistic elements or features intended to appear specifically tailored to the recipient. For example, they might be signed by autopen and use features such as mail merge, which automatically inserts the names of the individual recipients.

https://en.wikipedia.org/wiki/Form_letter

Pismo zatytułowane to „upoważnienie, zawiadomienie, protokół”.
Autorka, wymienia osiem elementów takiego pisma tj.: pieczęć osoby piszącej, datę wraz z miejscowością, tytuł czy inaczej nagłówek, treść zasadniczą czyli główną, kluczową oraz pożegnanie, podpis, załączniki czyli dodatkowe dokumenty oraz tzw. rozdzielnik

- http://wsp.pl/file/825_946025715.pdf - page 7

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A business letter is a letter from one company to another, or such organizations and their customers, clients, or other external parties. The overall style of letter depends on the relationship between the parties concerned. Business letters can have many types of content, for example to request direct information or action from another party, to order supplies from a supplier, to point out a mistake by the letter's recipient, to reply directly to a request, to apologize for a wrong, or to convey goodwill. A business letter is sometimes useful because it produces a permanent written record, and may be taken more seriously by the recipient than other forms of communication. It is written in formal language - https://en.wikipedia.org/wiki/Business_letter


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