How to Set a Different Signature per Account on iPhone

Most people never change the iPhone Mail signature default. iOS ships with a single shared signature that appends to every outgoing message from every account, and once that line says what you want it to say, it stops being visible. The problem surfaces when you have a work address and a personal one on the same phone, and both go out signed the same way — the professional block appearing on a casual note to a friend, or 'Sent from my iPhone' landing at the bottom of a client proposal.

This walkthrough covers the iOS setting that switches from one shared signature to per-account signatures, how to remove the default sent-from line, what limits the formatting editor on iPhone, why the signature sometimes disappears on replies, and why the iPhone signature often looks different from the Mac one even when you type them to match. Verified against iOS 18 and current builds as of August 2026.

The short answer#

The setting is in the iOS Settings app, not inside Mail. Open Settings, scroll to Mail, tap Signature, and change the control at the top from All Accounts to Per Account. Once you do that, iOS shows a separate text area for each mail account configured on the device. Tap an account name, clear any existing text, type the new signature, and repeat for each account. iOS saves as you type — there is no save button.

The work account gets the professional block, the personal one gets whatever you prefer, and they no longer share a line. The change applies to every new message and reply from each account immediately.

Before you start#

Two things need to be true before switching to per-account signatures.

• Every account you want a separate signature for must already be added to iPhone. The Per Account view only shows the accounts iOS knows about. If an account is missing, add it in Settings > Mail > Accounts first, then come back to Signature.
• This setting only affects the built-in Mail app. Third-party email clients — Gmail, Outlook, Spark and others — manage their own signatures inside their own apps, entirely separately from this screen. Changing this setting has no effect on them.

Steps: switch from one shared signature to per account#

1. 1

   Open the iOS Settings app

   Go to the home screen and open Settings — the grey gear icon. Do not open the Mail app. The signature editor is not there.

2. 2

   Scroll to Mail and tap it

   Mail is grouped with Contacts and Calendar, roughly in the middle of the settings list. Tap Mail to open its settings panel.

3. 3

   Tap Signature

   Scroll down to the Composing section and tap Signature. This opens the signature editor, which by default shows a single text field for all accounts.

4. 4

   Switch from All Accounts to Per Account

   At the top of the screen is a control with two options: All Accounts and Per Account. Tap Per Account. The single shared text field expands into a separate text area for each mail account configured on your device, labelled by account name or address.

5. 5

   Type each account's signature

   Tap inside the text area under the account you want to edit first, select all and delete the existing text, then type the new signature. Repeat for each account. The editor is plain text — no font, size or colour controls. Those exist in Apple Mail on Mac but not in this iOS editor.

6. 6

   Leave the screen — changes save automatically

   iOS saves the signature text as you type. There is no save or done button to tap. Navigate away to the home screen or open Mail directly. The new per-account signatures are active immediately for both new messages and replies.

How iPhone signatures compare to Mac and other email clients#

The most common frustration after setting up per-account signatures on iPhone is that the result looks different from the Mac version, even when you typed the same text. That is a platform limit, not a configuration error. The table below shows where iPhone, Mac and web-based clients differ on every dimension that matters for signature management.

What to do when the signature is not showing#

A signature that looks correct in Settings but does not appear in outgoing messages usually has one of four causes. Work through them in order before assuming a bug.

The first is the plain text message format. If a specific message is composed in plain text, the signature text is still appended but any image-based signature disappears, because plain text cannot carry images. Since the iOS editor is plain text anyway, this is rarely the issue on iPhone — but it matters when the signature was originally created on Mac with inline images and you are trying to match it.

The second is scroll position on replies. On some iOS versions, Mail places the signature below the quoted text in a reply, and the default scroll position in the compose window does not show it. Scroll down in the compose window past the quoted block — the signature is usually there. It is appended; it is just not in the viewport.

The third is an account mismatch. If the From field in a compose window shows a different account than the one whose signature you just set, the signature follows the From account, not the account you expected. Tap the From field and check which account is selected.

The fourth is a post-update reset. After a major iOS version upgrade, some users find the Signature setting has reverted to All Accounts with a shared text. The per-account configuration is not always preserved across upgrades.

A faster way for multi-account inboxes#

The six steps above give every iPhone account the right signature. The remaining overhead is that every message still requires you to draft and send it yourself. If a meaningful share of your day is multi-account email — separate work, personal and client addresses all running through the same phone — the signature is a small part of the manual load, not the whole thing.

AI Emaily is an AI email client that handles drafts, replies and triage across Gmail, Outlook and standard IMAP accounts. In Copilot mode, it generates a draft against a Personal Context brain and per-client profiles you configure, then holds it for your review before anything sends. Signatures are managed per account inside AI Emaily's settings, so they are already in the draft before you review it. We build AI Emaily, so that is the context for naming it here: it addresses the composition layer that these iOS settings do not.

AI Emaily is a separate client and does not change how the built-in iPhone Mail app behaves. If per-account signatures in the system app are what you need, the steps above are the complete answer. AI Emaily is the option when the problem is larger: high volume across several accounts, time spent composing more than configuring, or wanting a draft ready to approve rather than a blank compose window. A 7-day free trial is available at aiemaily.com/pricing — card required, no charge if cancelled before day 7.