Textform
A readable declaration, e.g. letter, e-mail or fax – no signature needed.
For some declarations text form is enough, e.g. a rent increase request (§ 558a Abs. 1 BGB) or an objection to a notice on your flat (§ 574b Abs. 1 BGB). Written form, by contrast, requires a handwritten signature.
How it appears in the letter
»… ist in Textform zu erklären«