Email signature

Why your email signature is doing more work than you think

The obvious job is contact info. Nobody has to dig through a six-month-old thread to find your phone number. It's right there.

But the real value is what it signals before anyone reads a word of your message. A clean, complete signature says you take the correspondence seriously, the same way good email etiquette does in the message body itself. No signature, or a messy one with three fonts and a stretched logo, says the opposite. For the professionals we write for, people managing client relationships and deals where every email carries some weight, that first impression matters more than it seems like it should.

Signatures can also do quiet, useful work beyond identification. A link to your booking calendar saves a whole round of "when are you free" emails. A line pointing to your latest case study does light marketing without feeling like an ad. And it works quietly in the background, you set it up once and it just keeps paying off on every message after.

HTML or plain text: which signature actually fits your job

You've got two real options here.

HTML signatures support colors, logos, clickable icons, and proper formatting. Most professionals use these because they look finished and reinforce a brand at a glance. If your role involves any external-facing correspondence, this is probably your default.

Plain text signatures are just text, no images, no styling. Less polished, sure. But they render correctly everywhere, no exceptions. Some industries, legal and government especially, still lean plain text because it's guaranteed to display the same way on every device and email client.

A lot of people keep two versions: a full signature for new messages, and a shorter one, name and one contact method, for replies deep in a thread where nobody needs your full bio again.

How to set up your email signature

In Gmail:

1. Open Gmail and click the gear icon, then See all settings.
2. Scroll to the Signature section and add your signature text.
3. Format it with the toolbar if you want bold, links, or an image.
4. Scroll down and click Save Changes.

In Outlook: Steps vary a bit depending on whether you're on new Outlook, classic Outlook, or the web, so if the path below doesn't match your screen, Microsoft's signature guide has the current version for your setup. In classic Outlook for Windows, it's File > Options > Mail > Signatures. 

In Spark:

1. Open Spark Settings and select Composer > Signatures.
2. Click Create Signature.
3. Type your text, or paste HTML code if you have a designed signature ready.
4. Save, then set it as the default for any account under Default signatures.

Spark also lets you keep multiple signatures and switch between accounts without rebuilding anything, which is worth knowing if you're juggling a work and a personal address.

Six rules for a signature that doesn't look like clutter

Keep it short. Three to five lines. Name, title, company, one or two contact methods. Beyond that, you're just adding scroll to every reply in a thread.

Stick to safe fonts. Arial, Helvetica, Georgia. Boring, but reliable. They're what every email client your recipient might be using can actually render. 

Limit yourself to two or three colors. Match your brand if you've got one. Past that, it starts looking like a ransom note.

Keep images small. Around 50 to 80 pixels tall, under 100KB. Big images slow loading and can trip spam filters on the receiving end. 

Make links look clickable. If there's a booking link or social icon, use a standard style so people actually notice it's clickable. But don't overdo it with five icons nobody will click anyway.

Test it on mobile. Most email gets read on a phone now. If your signature falls apart on a six-inch screen, simplify it.

Related terms

• Email client
• Email etiquette
• HTML email
• Custom email domain