Professional email signature best practices: 10 rules and a checklist
What should a professional email signature include, how should you prepare your logo and images, and what should you avoid? Ten practical rules and a checklist.
An email signature is a small business card your company shows hundreds of times a day. A well-made signature builds trust and makes it easy to get in touch; a messy one does the opposite. These rules are a starting point for a clean, professional signature that works for the whole team.
1. Make it obvious who is writing
Full name, job title and company name should be the most visible part of the signature. Setting the name slightly larger or in bold gives the eye a natural starting point.
2. Keep contact details short
Phone, email and website are usually enough. Adding every channel (several phone numbers, fax, every social account) makes the signature crowded. Pick the channels people actually use.
3. Make the links clickable
Tapping the phone number should start a call, and clicking the email address should open a new message. That requires an HTML signature with real links, not a single image.
4. Use one template for the whole team
Signatures where everyone picks their own font and colors weaken your brand. Choose one template and generate everyone's signature from it. Creating signatures in bulk from your employee spreadsheet is the fastest way to stay consistent.
5. Keep the width reasonable
A common practice is to keep signatures around 600 pixels wide so they don't cause horizontal scrolling in email clients. Keep them short, too — a signature shouldn't take up more space than the email itself.
6. Use a sharp, balanced logo
Prepare your logo at high resolution so it doesn't look blurry on high-density (retina) screens, but don't let it dominate. It should be balanced with the name, title and contact details.
7. Host your images online
Logos and icons work most reliably in clients like Gmail and Outlook on the web when they load from a public https address. When images are embedded in the email, some clients don't show them or display them as attachments.
8. Make sense with images turned off
Some recipients block images by default. In that case, the alt text of linked images is shown instead. If the linked parts of your signature carry the phone number and email address as alt text, the signature stays useful even with images off. mailimza adds this automatically.
9. Don't leave gaps for missing details
Not everyone on the team has a mobile number or a job title. Your template should hide an empty line and move the rest up; otherwise some signatures end up with awkward gaps.
10. Check legal and company requirements
Some companies add their registered name, address or a confidentiality notice to signatures. What your company must include depends on where it operates, so check with your legal advisor. Put long legal text at the very bottom, small and simple.
Checklist
- Name, title and company are prominent
- At most 3–4 lines of contact details
- Phone, email and website links are clickable
- The whole team uses the same template
- Width is around 600 pixels
- The logo is high-resolution and balanced
- Images are hosted at a public address
- Missing details don't leave gaps
- Tested in Gmail, Outlook and on a phone
Instead of applying all of this by hand, you can start from a ready-made template in mailimza and create your team's signatures in minutes. For installation, see the Gmail and Outlook guides.