9 email signature best practices for 2026
A signature is the one piece of design you ship dozens of times a day. Get it right and it works quietly in the background; get it wrong and it breaks, gets filtered, or just looks cheap. Here are the rules we bake into every GlowSig template.
1. Build it with tables, not divs
Email clients in 2026 still render like browsers did twenty years ago. Flexbox and grid are unreliable; nested HTML tables with inline styles are the only layout method that survives Gmail, Outlook and Apple Mail intact. If your signature uses modern CSS layout, it will collapse somewhere.
2. Inline every style
Most clients strip <style> blocks and external stylesheets. Every color, font and spacing rule has to live in a style="" attribute on the element itself. Tedious by hand, which is exactly why a generator helps.
3. Keep it under ~600px wide and mobile-first
Over half of email is opened on phones. Stay within roughly 600px, keep your photo modest (64–80px), and avoid wide multi-column layouts that force horizontal scrolling on a small screen.
4. Use web-safe fonts with fallbacks
Custom fonts don't load in email. Stick to Arial, Helvetica, Georgia or system stacks. Your beautiful brand typeface belongs on your website and your Signature Page, not in the signature.
5. One call-to-action, not a wall of links
Five competing links means zero clicks. Pick the single most valuable action, book a call, see the portfolio, read the latest post, and make it a clear button. Everything else can live one tap away on your hub.
6. Don't rely on images to carry the message
Many clients block remote images until the reader clicks "load images." If your name, title and links are baked into one image, they vanish for those readers. Keep critical text as real, selectable text; use images only as enhancement.
7. Add proper alt text and real links
Give every image alt text so it degrades gracefully, and make links genuine <a href> tags (including tel: for phone and mailto: for email) so they're tappable on mobile.
8. Animate carefully
Animated GIFs work in most clients, but some Outlook versions show only the first frame. If you use an animated banner, make sure that first frame stands on its own. For anything richer, video, music, rotating quotes, link out to a hub instead of trying to force it into the email.
9. Keep it consistent everywhere
Same name, title, company and colors across every team member and every device. Consistency is what builds recognition and branded search over time. A shared generator keeps everyone on-brand without a designer in the loop.
The common mistakes to avoid
- Pasting a signature copied from a Word doc (it drags in broken markup).
- Huge logos that push your text off-screen on mobile.
- Low-contrast gray-on-gray text that fails accessibility.
- Social icons linking to half-dead profiles.
- A different signature in every reply because it wasn't set as default.