Email Signature Best Practices: The Do's and Don'ts
Your email signature is attached to every message you send. For most professionals, that's 30-50 emails a day, 150-250 a week, thousands a year. It's the most-seen piece of “marketing” you have — and yet most people set it up once in 2019 and never look at it again.
Here's the good news: getting it right is not complicated. Follow the do's, avoid the don'ts, and you'll have a signature that looks professional, renders correctly everywhere, and actually helps people contact you. Let's get into it.
Build a Best-Practice Signature in 60 Seconds
SignForge templates follow all these rules by default — web-safe fonts, inline CSS, table layout, clean design.
Create My Signature →Works with Gmail, Outlook, Apple Mail & more
The Do's
Keep it to 3-4 lines of content
Name, title, company, and one or two contact methods. That's it. A signature is a business card, not a biography. If a recipient has to scroll past your signature on mobile, it's too long.
Use web-safe fonts only
Arial, Verdana, Georgia, or Trebuchet MS. Custom fonts (including Google Fonts) do not load in Outlook and are stripped by Gmail. Your beautiful Montserrat will render as Times New Roman on half your recipients' screens.
Write all styles inline
Every font-size, colour, and spacing rule must be in a style="..." attribute on the element itself. Gmail strips <style> blocks entirely. Outlook ignores them. There is no shortcut here.
Use table-based layout
Outlook's rendering engine is Microsoft Word — not a browser. CSS flexbox and grid do not exist in Word. If you want columns (logo on left, text on right), you need an HTML <table>.
Include a clear call-to-action
A link to book a call, view your portfolio, or visit your website. One link that matters more than five links nobody clicks. Make it obvious what you want the reader to do next.
Host images on your own domain
Company logo? Host it at https://yoursite.com/logo.png. Gmail and Outlook can both fetch HTTPS images reliably. This also means you can update the logo once and every signature updates automatically.
Test in multiple clients before rolling out
Send yourself a test email and check it in Gmail, Outlook, and on your phone. What looks perfect in Gmail can break dramatically in Outlook. Five minutes of testing saves weeks of embarrassment.
Pro Tip
The Don'ts
Don't use inspirational quotes
"Be the change you wish to see in the world" in your signature tells people exactly one thing: you haven't updated it since 2015. Quotes waste space and dilute your professional message.
Don't embed base64 images
Encoding images as base64 data directly in the HTML makes the signature huge and breaks in Gmail. Always use hosted image URLs. No exceptions.
Don't add your email address to your signature
Think about it: the recipient already has your email address — they're reading an email from you. Including it is redundant and wastes a line. Use that space for your phone number instead.
Don't use more than 2 font sizes
Name at 16-18px, everything else at 12-13px. Three or more font sizes create visual chaos. The hierarchy should come from weight (bold vs. regular) and colour, not from a festival of font sizes.
Don't include a legal disclaimer unless required
Unless your legal or compliance team mandates it, skip the "This email is confidential..." paragraph. It has no legal force in most jurisdictions and adds 4-5 lines of text nobody reads.
Don't use animated GIFs
Animated logos and blinking text scream 2004. They also increase file size, trigger spam filters, and don't animate in Outlook (which shows only the first frame). Just don't.
Don't add too many social icons
Pick 2-3 platforms that you actually use professionally. A row of 8 social icons where half lead to abandoned profiles does more harm than good. LinkedIn and one other is usually enough.
Don't use coloured backgrounds
A signature with a dark blue background and white text might look striking in your editor, but it creates ugly padding inconsistencies across email clients. Stick with white or transparent backgrounds.
The Ideal Signature Structure
Jane Smith
Senior Product Designer at Acme Corp
+44 7700 900123 | janesmith.design
Four lines. Name, role + company, contact details, and 1-2 social links. That is it. It works in every email client, looks clean on mobile, and gives the recipient everything they need without anything they don't.
Related Guides
Build a Signature That Follows All the Rules
SignForge handles the technical stuff — inline CSS, table layout, web-safe fonts. You just fill in your details.
Create My Signature →Works with Gmail, Outlook, Apple Mail & more