# 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** [ ![Hand holding a phone with an open WhatsApp chat next to a laptop](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_whatsapp_widget_dsgvo_e2dba69938.png) Previous Post The WhatsApp button on a website and the GDPR](/en/blog/whatsapp-widget-dsgvo) [ ![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 [![An editor working in video editing software with AI features on screen](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_ki_tools_videoschnitt_vor_und_nachteile_f3a71162be.png)](/en/blog/ki-tools-videoschnitt-vor-und-nachteile) #### [What AI Editing Tools Actually Do, and What They Don't](/en/blog/ki-tools-videoschnitt-vor-und-nachteile) October 16, 2026 [](/en/blog/ki-tools-videoschnitt-vor-und-nachteile) [![A video editor reviewing a flawed shot on a monitor before deciding on a reshoot](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_content_nachdrehen_oder_um_fehler_schneiden_f8735cb368.png)](/en/blog/content-nachdrehen-oder-um-fehler-schneiden) #### [When a Reshoot Pays Off and When Editing Can Save the Footage](/en/blog/content-nachdrehen-oder-um-fehler-schneiden) October 15, 2026 [](/en/blog/content-nachdrehen-oder-um-fehler-schneiden) [![A video editor selecting a cover frame for a video on a laptop screen](/_ipx/f_webp,q_75/https://cms.illia-biztech.de/uploads/medium_thumbnail_vorschaubild_video_wirkung_a1fe6c0cd9.png)](/en/blog/thumbnail-vorschaubild-video-wirkung) #### [Why the Video Thumbnail Decides Whether Anyone Clicks](/en/blog/thumbnail-vorschaubild-video-wirkung) October 14, 2026 [](/en/blog/thumbnail-vorschaubild-video-wirkung) 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 companies in Germany in German, English, Russian and Ukrainian, from the first version through ongoing maintenance and search visibility work. One monthly plan covers the website, advertising and content, the scope is agreed in advance and can be moved between them when priorities change. The domain, hosting and ad accounts stay registered to the company, so the work can continue on the existing setup without a full rebuild. That fits businesses moving to Germany or expanding into the German-speaking market who want to explain their task once.