Email Signature Dos and Don'ts: 14 Rules Professionals Actually Follow

You probably send between 30 and 100 emails a day. Each one ends with your signature, which means that small block of text is quietly doing more brand work than your business cards, your slide decks, and half your website combined. Yet most signatures are either an afterthought or a cluttered mess of icons, disclaimers, and quotes.

Here are the rules that separate a signature that builds trust from one that gets ignored, or worse, breaks the moment it lands in someone else's inbox.

The dos

Do keep it to four or five lines

Name, title, company, and one or two ways to reach you. That is almost always enough. A signature is a name tag, not a resume. If a reader has to scan past six lines to find your phone number, the design is working against you.

Do build a clear visual hierarchy

Your name should be the largest and boldest element, followed by your role and company, then your contact details in a smaller, lighter treatment. This lets someone find what they need in a fraction of a second. Bold your name, keep everything else at a normal weight, and resist the urge to color every line differently.

Do design for a phone first

Well over half of all email is opened on mobile. A signature that looks tidy on a wide monitor can wrap awkwardly on a narrow screen. Keep line lengths short, use a single column where you can, and make any tappable link large enough to hit with a thumb.

Do use web-safe fonts

Arial, Helvetica, Georgia, and Verdana render consistently across Outlook, Gmail, and Apple Mail. Custom or downloaded fonts do not travel; the recipient's client silently swaps them for a default and your careful spacing falls apart. Stick to the fonts every device already has.

Do keep your links readable as plain text

Link your name to your site and add a tel: link to your phone number if you like, but make sure the plain text is still legible when images or styles are stripped. Many corporate inboxes block images by default.

The don'ts

Don't put text inside an image

It is tempting to design a beautiful signature in a graphics tool and paste it in as one big picture. Don't. When images are blocked, your entire signature disappears into a blank rectangle. Screen readers cannot read it, links inside it do not work, and it looks blurry on high-resolution displays. Signatures should be live HTML text, not a screenshot.

Don't collect social icons like stamps

Two or three relevant links are useful. Eight are noise. Include only the profiles you actually maintain and that matter for the relationship, usually LinkedIn for most professionals plus one platform where your work lives.

Don't oversize your logo

A logo taller than about 60 pixels starts to dominate the message. Keep it modest and let your name lead. If you need help, our guide on adding a logo to your email signature covers sizing and hosting.

Don't paste directly from a design tool

Copying from Word, Google Docs, or a page builder drags along invisible markup that Outlook in particular mangles. The result is inconsistent spacing, phantom borders, and fonts that ignore your settings. Use HTML built for email.

Don't add a motivational quote

An inspirational line at the bottom of every email reads as personal branding to you and as clutter to everyone else. If your company requires a legal notice, that is different; see our email disclaimer examples for how to keep it short.

Don't repeat the email header

Your name and address are already visible in the "from" field. You can usually drop your email address from the signature itself and reclaim a line.

A good rule of thumb: if you removed a line and no one would miss it, remove it. Every element in a signature should earn its place.

Putting it together

The best signatures feel effortless because someone did the work of subtraction. Start with your name, add only what a recipient genuinely needs, test it in the three big clients before you commit, and check it on your phone. If you would rather not hand-code the HTML, a tool like Sigmint builds a clean, client-safe signature for you and previews it in Outlook, Gmail, and Apple Mail before you paste it in, with no account required.