What is an Email Signature?
Everything you need to know about email signatures — what they are, why they matter, what to include, and how to create a professional one that works in every email client.
Last updated: March 2026 • 10 min read
Email Signature Definition
An email signature is a block of text, images, and links that is automatically appended to the end of every email you send. It serves as a digital business card, providing recipients with your identity, contact information, and brand presence in every message.
A professional email signature typically includes your name, job title, company, phone number, email address, website, company logo, and social media links. More advanced signatures can include a professional headshot, promotional banners, and clickable call-to-action links.
Email signatures are configured once in your email client (Gmail, Outlook, Apple Mail, etc.) and then automatically appear at the bottom of every new email, reply, and forward you send.
Modern email signatures use HTML (HyperText Markup Language) to create rich, formatted layouts with images, colours, fonts, and clickable links — far more professional than plain text signatures.
Why Email Signatures Matter
Professional Image
A branded email signature makes every email look polished and professional. It's often the last thing a recipient sees — and first impressions matter.
Easy Contact
Recipients can instantly call you, visit your website, or connect on social media without searching for your details. Phone numbers become click-to-call on mobile.
Brand Reinforcement
Every email becomes a branding touchpoint. Your logo, colours, and design language are repeated hundreds of times per day across your team.
Trust & Credibility
A professional signature signals that you're a legitimate, established professional. Emails without signatures can appear informal or untrustworthy.
Marketing Channel
Use banner images to promote events, products, or campaigns. Every email becomes a passive marketing opportunity at zero extra cost.
Legal Compliance
Many industries require disclaimers, registration numbers, or regulatory information in email communications. Signatures handle this automatically.
What to Include in Your Email Signature
Essential Elements
- Full name — Your first and last name, clearly displayed
- Job title — Your role within the organisation
- Company name — Your business or organisation
- Phone number — With click-to-call functionality for mobile users
- Email address — Clickable mailto link
- Website — Your company website URL
- Company logo — Your brand mark, optimised for email
Recommended Extras
- Professional headshot — Increases trust and personalises your emails
- Social media icons — LinkedIn, Instagram, Facebook, Twitter, etc.
- Physical address — Especially for businesses with a physical presence
- Promotional banner — Showcase events, new products, or special offers
- Call-to-action — "Book a meeting", "View our portfolio", etc.
Types of Email Signatures
Plain Text Signature
Simple text-only signature with name, title, and contact details. No images or formatting. Works everywhere but looks basic and unprofessional compared to HTML signatures.
HTML Email Signature
Rich signatures using HTML code with images, colours, fonts, links, and structured layouts. The industry standard for professional email signatures. Requires proper inline CSS for email client compatibility.
Image-Only Signature
A single image containing all signature information. Looks clean but has major drawbacks: images can be blocked by email clients, text isn't selectable or searchable, and links don't work. Not recommended.
Hybrid Signature
The best approach: HTML text for critical information (name, phone, email) combined with images for logos and headshots. This is what professional email signature generators like EmailSignatures.au create — ensuring information is always accessible even if images are blocked.
Email Signature Best Practices
- Keep it concise. Stick to 3-4 lines of text plus visual elements. Overly long signatures are overwhelming and unprofessional.
- Use your brand colours. Match your signature colours to your company brand for consistency across all communications.
- Optimise image sizes. Logos should be 100-200px wide. Headshots should be 80-100px. Keep total file size under 50KB.
- Make phone numbers clickable. Use tel: links so mobile users can tap to call directly from your signature.
- Include social media icons, not URLs. Visual icons are cleaner and more clickable than full social media URLs.
- Test in multiple email clients. Always verify your signature renders correctly in Gmail, Outlook, and Apple Mail before rolling it out.
- Use inline CSS. Email clients strip external stylesheets and <style> blocks. All CSS must be inline for signatures to display correctly.
- Maintain consistency across your team. All employees should use the same signature template with consistent branding.
- Update regularly. Review your signature every 3-6 months. Update when job titles, phone numbers, or branding changes.
- Don't use "Sent from my iPhone". Replace the default mobile signature with a professional version for a consistent brand image.
Email Signature Compatibility
Email signatures need to work across many different email clients, each with their own rendering engine:
- Gmail — Uses a web rendering engine. Generally displays HTML signatures well. Strips some CSS properties.
- Outlook Desktop — Uses Microsoft Word's rendering engine (not a browser engine), making it the most challenging client for signature compatibility. Requires table-based layouts and inline styles.
- Outlook Web — Browser-based rendering, more forgiving than desktop Outlook.
- Apple Mail — WebKit-based rendering. Generally handles HTML signatures well.
- Thunderbird — Gecko-based rendering. Good HTML support.
- Mobile clients — Gmail, Outlook, and Apple Mail apps on iOS/Android handle signatures well when they use responsive design.
Professional email signature generators like EmailSignatures.au create signatures with clean, inline HTML that's tested across all these clients — including the notoriously challenging Outlook desktop.
How to Create a Professional Email Signature
You have three main options for creating an email signature:
1. Email Signature Generator (Recommended)
The easiest and most reliable method. An email signature generator like EmailSignatures.au provides professionally designed templates, a live preview editor, and ensures your signature works across all email clients. Choose a template, enter your details, upload your logo, and your signature is ready in under 2 minutes.
2. Manual HTML
If you're comfortable with HTML code, you can build a signature manually using tables for layout and inline CSS for styling. This requires technical knowledge and extensive testing across email clients. Not recommended unless you're a web developer.
3. Email Client Built-In Editor
Gmail, Outlook, and Apple Mail have basic signature editors built in. These support simple text formatting and image insertion, but offer very limited design options compared to dedicated generators.
Email Signature Statistics
Emails sent globally per day in 2026
Of professionals say email is their primary business communication tool
More brand impressions from email signatures than social media posts
Of recipients view email signatures as part of a company's brand identity
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