Email Signatures: Required Information and Design at a Glance

The email signature is often the last thing a recipient reads in a business message, and yet it is frequently overlooked when designing newsletters and email communications. However, it is not only legally relevant but also a small yet constantly visible element of brand identity.

Table of Contents

What Information Is Required by Law

Creating a Good Signature

Consistency across the entire team

Signatures in Automated Messages

Technical and Design Pitfalls

What Information Is Required by Law

In Germany, business emails sent by corporations such as GmbHs or UGs must include mandatory information similar to that required in the legal notice. This typically includes:

Full company name, including legal form
Court of Registration and Commercial Registry Number
Company Headquarters
Names of the management or board members

Sole proprietors and self-employed individuals are generally exempt from this requirement, but should still provide basic contact information. Since requirements vary depending on legal status, it’s worth conducting a brief legal review of your signature if in doubt.

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Creating a Good Signature

In addition to the required information, a signature should remain clear and concise and not appear overloaded with details. Useful elements include your name, title, direct contact information, the company logo, and links to the website and relevant social media profiles.

Make sure your signature isn’t distorted on mobile devices—many versions of Outlook and webmail clients render HTML signatures differently. Test your signature on at least three different email clients before rolling it out.

Signatures are also often used to subtly highlight current campaigns or a newsletter, similar to what’s common in traditional email marketing, though in a much more understated way.

Font size 10–11pt for optimal readability
Maximum of 4–5 lines of text without graphics
Format the phone number with the country code
Use colored elements sparingly

Consistency across the entire team

In larger companies, several slightly different versions of the signature often develop over time because individual employees make their own adjustments. This creates an inconsistent appearance to the outside world and can even lead to legal issues regarding required information if outdated company data continues to be used. It therefore makes sense to use a central template that is distributed to all mailboxes via a shared signature management system or the mail server, rather than maintaining each signature individually in the email program. This allows changes to addresses, phone numbers, or campaign banners to be made in one place and take effect immediately throughout the entire company.

Automatic signature updates without employee intervention
Ensure legal compliance through centralized data control
Ensure branding consistency across all communication channels
Implementation via Active Directory or a cloud solution

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Signatures in Automated Messages

Not only personally written emails, but also automated messages from newsletters, support systems, or order confirmations are often sent from a dedicated sender address with a signature in the footer. Different requirements often apply here than in personal correspondence—for example, a greater emphasis on unsubscribe links, contact information for inquiries, and legally required disclosures, which apply to mass emails just as they do to individual messages. Anyone using automated systems should regularly review their signatures alongside the company’s personal signatures to ensure that outdated information isn’t sent out unnoticed for months on end.

Opt-out option required under CAN-SPAM and GDPR
Check automatic signatures monthly to ensure they are up to date
Configure bounce addresses for feedback
Support emails must include a ticket number in the signature

Technical and Design Pitfalls

Signatures are displayed on a wide variety of email clients and devices, ranging from desktop programs to mobile apps. Images that are too large, embedded graphics instead of actual text, or too many colors can quickly lead to display errors. Simple HTML signatures with clearly separated lines of text, a small logo, and just a few working links have proven effective, ensuring that the signature looks the same on every system.