A DIN letter template like the one we use at Typst

din-letter.typ

/*
DIN Letter template

Save this file in your project. Use it like this
in your project file:

#import "template.typ": *

#show: letter.with(
  sender: [
    Acme Inc\
    Musterstraße 100, 10623 Berlin, Germany \
    #link("https://example.com")#h(2mm)#link("mailto:hello@example.com")
  ],
  address: [
    Trading Goods Inc \
    Pappelallee 23 \
    12345 Neustadt \
    Germany
  ],
  date: [Berlin, March 26h, 2023],
  subject: "Our Discussion on Breadcrumbs",
  footer-cells: (
    (
      title: [Acme Inc],
      content: [
        Musterstraße 100 \
        10623 Berlin \
        Germany
      ],
    ),
    (
      title: [Directors],
      content: [
        Petra Mustermann \
        #link("mailto:mustermann@example.com")
      ],
    ),
    (
      title: [Registry Court],
      content: [
        Amtsgericht\ Berlin-Charlottenburg \
        #text(weight: 600, "VAT ID") DE123456789
      ],
    ),
  ),
)

// Your letter goes here

*/

#let letter(
  address: none,
  sender: none,
  date: none,
  subject: none,
  logo: none,
  footer-cells: (),
  body
) = {
  set text(lang: "en", 10pt, font: "HK Grotesk")
  set enum(numbering: "(1)")
  set list(marker: "–")
  show heading: set block(below: 1.25em, above: 1.5em)
  show heading: (it) => {
    set text(if it.level == 1 {12pt} else {10pt})
    it
  }

  
  set page(
    margin: (
      top: 3.25cm,
      bottom: 5cm,
      left: 2.5cm,
      right: 2cm
    ),
    header: if logo != none {
      place(bottom+right, image(height:1cm, logo))
    },
    footer: v(1fr) + par(text(7pt, fill: rgb("#565565"), grid(
      columns: (1fr,) * footer-cells.len() + (auto,),
      column-gutter: 8pt,
      ..footer-cells.map(cell => align(bottom, {
        text(weight: 600, upper(cell.title))
        linebreak()
        cell.content
      })),
      align(right+bottom)[Page #counter(page).display() of #locate(loc => counter(page).final(loc).first())]
    ))) + v(1.5cm)
  )

  v(2cm)
  box(width: 60mm)[
    #text(7pt, fill: rgb("#565565"), sender)
  
    #address
  ]
  align(right, date)

  v(8.4mm)

  strong(subject)
  parbreak()
  body
}