Email signature etiquette: what is polite, what is noise

Email signature etiquette comes down to one idea: the signature exists for the reader, so it should shrink when the reader no longer needs it. Use the full version on a first message, a short one on replies, and little or nothing deep in a thread between people who already know each other.

The email signature etiquette rules below are our judgement about what readers find useful, not a standard and not a survey result. Where a mail app’s behaviour matters, we say which help page we read in October 2026: Gmail’s signature page and Microsoft’s Outlook signature page.

Email signature etiquette by situation

Read across the row that matches the message you are sending.

Situation	What to show	Why
New message to someone who does not know you	Full: name, title, company, one number, website	They have nothing else to go on.
Message that may be forwarded	Full, with company and website	It will reach people who have never heard of you.
Reply within a day or two	Short: name, title, one number	They have your details from the first message.
Long thread, fifth reply or later	Name only, or nothing	The details are a scroll away, and a tall block repeats on every line of the thread.
Internal message to colleagues	Short, no banner, no extra legal line unless your company requires it	Everyone already knows who you are.
Message from a phone	The phone’s own signature, set up on purpose	Microsoft says signatures can be stored on the device where they were made, so the phone may have none.

The table is our rule of thumb. The mechanics are in the apps. Google’s page says you can choose a signature default for new emails and for emails you reply to, and that Insert signature at the bottom of the compose window changes it mid-message. Microsoft’s page describes a New messages dropdown and a separate Replies/forwards dropdown in classic Outlook. Our article on signatures on replies goes deeper on the second one.

Nine rules of email signature etiquette

1. Match the signature to the moment. The table above is the rule: full on first contact, short after that. A ten-message thread with a twelve-line block under every message is hard to read.
2. Give one number per purpose, and label it. A reader should never have to guess which of four numbers to dial. If you need a mobile and a desk line, say which is which.
3. Do not make a reader load a picture to learn your name. Microsoft says classic Outlook blocks automatic picture downloads by default (Microsoft Support). A signature that is one image shows up as a gap.
4. Write link text that says what the link does. “Book a 20-minute call” beats “click here”. The W3C’s link purpose criterion says the purpose of a link should be clear from its text or its context. It is a web accessibility standard, but readers with screen readers meet your signature too.
5. Keep the legal line to what you must show. A short sentence, in small type, once. Stacking a long confidentiality block under every internal message is noise, and the wording your sector needs is a question for your own compliance officer. General information, not legal advice.
6. Leave out quotes and mottos. They tell the reader about you and nothing about how to reach you. If your company wants a tagline, make it part of the shared design and not each person’s choice.
7. Do not say your name three times. If the message ends “Thanks, Priya” and the signature starts with “Priya Raman”, that is enough. See our sign-off examples for closings that do not repeat what follows.
8. Make the small text readable. The W3C’s contrast criterion asks for at least 4.5 to 1 for ordinary text. Pale grey such as #aaaaaa on white falls well short, at about 2.3 to 1.
9. Keep titles and numbers true. A title you gave yourself last week is fine. A title you lost last year is not. Our job title guide has examples.

The habits that break email signature etiquette

Some habits are worth naming because they are easy to fall into and invisible to the person doing them. Each one turns a useful signature into noise.

• A banner for a campaign that ended months ago. The reader sees an old offer on every message you send.
• An image of your whole signature. It cannot be copied, searched or read aloud, and it vanishes when images are blocked.
• Sending a long signature to a plain-text reader. Microsoft’s message formats page says plain text does not support showing pictures inside the message. If you know someone reads plain text, the text parts must carry everything.
• Social icons to profiles you never update. Keep one or none.
• Different fonts on every message. The signature should look the same each time.
• Typing a number in local format. A client abroad cannot dial 0803 000 0000. Use the international form, as in our guide to writing phone numbers internationally.

Setting up email signature etiquette so it is automatic

Most breaches of signature manners are accidents of setup, not choices. Make the defaults match the table.

1. Gmail: open Settings, then See all settings, and find the signature section. Create a full signature and a short one, and choose which one is the default for new emails and which for replies.
2. New Outlook: go to Settings, then Accounts, then Signatures, and choose which signature is added to new messages and which to replies and forwards.
3. Classic Outlook: open a new email and choose Message, Signature, Signatures. Use the New messages and Replies/forwards dropdowns. Microsoft notes that classic Outlook does not add a new signature to the message you opened to make it, so send a fresh one to yourself.

These steps follow the two help pages above. Menu names can change, and the pages win if they disagree with this one.

Email signature etiquette across a team

A rule that depends on each person remembering it will drift. The better habit is a short house rule written down, plus a shared design that makes the polite version the default. With emailfooter the company admin fixes the logo, colours and legal line, and each employee fills in their own details. Employees still install the result in their mail app by following the steps shown, because emailfooter does not push signatures into mailboxes. For the bigger picture of rules and rollout, see the email signature policy page.

Here is a full first-message signature that follows the table: role in words a client knows, one direct number, one company line, one website, a single short footer.

A full first-message signature. On replies, this would shrink to name, title and one number. The company and person are made up.

Good email signature etiquette is less about any one rule than about asking, before each message, what this reader already knows. If the answer is “everything”, send less. The email signature best practices article covers the build, and the mistakes guide shows what it looks like when the rules are ignored.

Frequently asked questions

What is good email signature etiquette at work?

Show the full signature on new messages and forwards, a short one on replies, and keep every fact as real text. One number per purpose, one link per purpose, and no quotes.

Does email signature etiquette change for replies?

Yes. By our rule the reply version drops the logo, the address and the legal line, and keeps name, title and one number. Gmail and Outlook both let you choose a different default for replies.

Does email signature etiquette allow a long signature?

It is not rude, but a block taller than the message is hard to scan, and it repeats on every message in a thread. Cut anything the reader would not use.

What does email signature etiquette say about legal disclaimers on internal email?

Put one only if your company requires it. Ask your compliance officer, and keep the wording to the sentence you must show.

Do professional email signature rules apply to mobile replies?

They apply the same way. Set the phone’s signature on purpose, in the same short form, so a reply from a phone does not look like a different company.