# Email signature requirements for German companies | Illia BizTech > Which details a business email signature must carry for a GmbH or UG, where that requirement comes from and how to check it. Source: https://illia-biztech.de/en/blog/email-signatur-pflichtangaben 1. [Home](/en) 2. [Resources](/en/blog) 3. What belongs in a GmbH's email signature ![Laptop screen showing a business email signature open](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_email_signatur_pflichtangaben_6bf262f70a.png) ![Portrait of Illia Belichenko, technical specialist at Illia BizTech](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/small_Illia_Belichenko_author_81f88864f0.png) By: Illia Belichenko September 3, 2026 # What belongs in a GmbH's email signature A business letter under German commercial law covers email too, so a message sent in the name of a GmbH or UG must carry the same details as a paper letterhead, the full legal name, legal form, registered seat, registry court, commercial register number and the names of the managing directors. That requirement sits separately from a website's Impressum and applies at the level of every single message rather than a page, so a business email without a signature carrying these details breaks the rule on its own, even when the website's Impressum is entirely in order. A UG must carry the addition haftungsbeschränkt in its signature too, exactly as on the website, and leaving it out makes the signature incomplete regardless of what else is there. A VAT identification number is not mandatory in the signature, though many companies mistakenly treat it as part of the list, what actually goes missing more often is the registry court and register number, since staff use personal signatures without those fields. Formally the requirement covers a business letter, in practice almost any automated message sent in the company's name falls under it, an invoice, an order confirmation or a system notification, not only a message a person wrote by hand. A send through a newsletter service also counts as a business letter in this sense, and the signature requirement exists separately from the consent requirement for the send itself, covered in a separate text on double opt in. In practice a single signature template set centrally in the mail client or through a company policy is easier to enforce than trusting every employee to fill in the details correctly by hand. Missing mandatory details can bring a fine through the registry court under the enforcement rules for the commercial register, a separate risk from a possible warning letter under unfair competition law over an incomplete Impressum. This text explains the legal requirements and does not replace legal advice. The exact scope of details depends on the company's legal form and the details of the case. **Share** [ ![Hands scheduling an appointment in a calendar on a tablet at a reception desk](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_online_terminbuchung_dienstleister_41fece3d67.png) Next Post Online booking instead of arranging times by email](/en/blog/online-terminbuchung-dienstleister) ![Portrait of Illia Belichenko, technical specialist at Illia BizTech](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/small_Illia_Belichenko_author_81f88864f0.png) ##### Illia Belichenko Illia is responsible for the technical side of Illia BizTech: website development, website updates, forms, integrations, automation and technical support. He works on connecting websites, content, advertising and internal workflows so they work together without creating unnecessary manual work. ##### Recent Posts [![Hands scheduling an appointment in a calendar on a tablet at a reception desk](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_online_terminbuchung_dienstleister_41fece3d67.png)](/en/blog/online-terminbuchung-dienstleister) #### [Online booking instead of arranging times by email](/en/blog/online-terminbuchung-dienstleister) September 2, 2026 [](/en/blog/online-terminbuchung-dienstleister) [![Printed report on a desk next to a pen and a cup of coffee](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_anfragen_messen_ohne_consent_23658781e2.png)](/en/blog/anfragen-messen-ohne-consent) #### [What stays measurable when visitors decline consent](/en/blog/anfragen-messen-ohne-consent) September 1, 2026 [](/en/blog/anfragen-messen-ohne-consent) [![Renovation work in progress in a room with daylight](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_website_neu_oder_ueberarbeiten_fd59884d90.png)](/en/blog/website-neu-oder-ueberarbeiten) #### [Rework the website or rebuild it](/en/blog/website-neu-oder-ueberarbeiten) August 31, 2026 [](/en/blog/website-neu-oder-ueberarbeiten) An email signature looks like a minor detail next to a website's Impressum, though formally it is a separate legal requirement. Illia BizTech checks, when setting up a client's mail, whether the registry court and register number actually sit in the signature, not just a logo and a phone number. Illia BizTech builds and maintains websites for small and medium businesses in Russian, German and English, from the first version through ongoing maintenance and SEO work. A team carries the project from idea to launch without long internal approval chains, so the client speaks directly with the people writing the code and managing the content, not through a chain of account managers. That fits businesses moving to Germany or expanding into the German-speaking market who want to explain their task once, not repeat it on every call.