Gmail Send As: How to Send From an Alias

Gmail Send As (the Send mail as setting) lets one Gmail account send from another address you own. Open Settings > See all settings > Accounts and Import, click Add another email address, then confirm the link Google emails to that address. Once verified, the alias shows up in the From line when you compose.

There is one big change to know first. Google's help pages say that starting January 2027, Gmail stops supporting Send as for third-party addresses like @yahoo.com, @outlook.com and @hotmail.com. Other Gmail addresses you own and Google Workspace aliases are not affected. During the late-2026 transition, Gmail may also block new third-party setups, so adding a Yahoo or Outlook address today can fail even though older setups still work.

This guide covers which addresses still qualify, the setup steps, the Workspace path, the errors that stop most people, and what to do if your alias is on the losing side of the 2027 change. Facts are checked against Google's help pages as of October 2026.

Which send-as addresses still work after January 2027?#

Google's dividing line is whether Google hosts the address. Anything Google hosts keeps working. Anything hosted by another provider loses send-as in January 2027, per Google's change notice.

How to set up Gmail Send mail as: step by step#

Do this in Gmail on a computer. The Gmail mobile apps don't have the Accounts and Import tab, but once an alias is set up you can pick it from the From line on your phone too.

1. 1

   Open Accounts and Import

   Click the gear icon in the top right, then See all settings. Open the Accounts and Import tab (on some accounts it is just called Accounts). The Send mail as section lists every address you can currently send from.

2. 2

   Click Add another email address

   A small window opens. Enter the name recipients should see (your name, "Support" or a brand name) and the address you want to send from. Leave Treat as an alias checked if the address is yours. Uncheck it only when you send on behalf of a separate person or mailbox, so replies don't land in your own inbox.

3. 3

   Enter SMTP details if Gmail asks for them

   For another Gmail address, Gmail handles sending itself and skips this screen. For an address hosted elsewhere, enter that provider's outgoing server, port, username and password. Google lists SSL on port 465 or TLS on port 587 (or 25) as the common combinations. Check your provider's help page for the exact values.

4. 4

   Click the link in the confirmation email

   Gmail sends a confirmation message from [email protected] to the address you just added. Sign in to that mailbox, open the message and click the link. If the window back in Gmail asks for a code instead, it is in the same email. The alias stays pending until you do this.

5. 5

   Pick the alias when you compose

   Open a new message and click the From line (if you don't see it, click the space next to the recipient field). Choose the alias. You can add up to 99 send-as addresses to one Gmail account.

6. 6

   Set the default From and the reply-to address

   Back in Send mail as, click make default next to the address you send from most. Then click edit info and choose Specify a different "reply-to" address if replies should go somewhere specific. Google notes that changing only the From can leave replies heading to your original Gmail address, so set both if you want everything on the alias.

Reply from the alias a message was sent to#

If people email several of your addresses, the setting that saves the most mistakes sits in the same section. Under When replying to a message, choose Reply from the same address the message was sent to. Gmail then opens each reply from the alias the sender used, instead of your default.

Without it, a customer who wrote to support@ gets an answer from your personal address unless you remember to change the From line every time. We cover the edge cases in our guide to making Gmail reply from the same address.

How Google Workspace aliases work#

On Workspace, an alias usually starts with the admin. In the Admin console, the admin opens Directory > Users, opens your account and clicks Add Alternate Emails. Each user can have up to 30 aliases at no extra cost, and Google says a new alias can take up to 24 hours to start working.

The admin can't add the alias to your From line for you. You still go to Accounts and Import > Add another email address and enter it yourself. Because the address already belongs to your account, Gmail normally accepts it without the outside-mailbox confirmation step that third-party addresses need.

If you need to send from an address hosted outside your Workspace domains, the admin has to allow it first under the per-user outbound gateways setting. Without that, Gmail won't let you enter an outside SMTP server. Remember that those external addresses fall under the 2027 change too.

What to do when send-as doesn't work#

Most failures come down to five causes. Match the symptom, then apply the fix.

Why recipients see "on behalf of" or your Gmail address#

Some mail apps, Outlook in particular, can show a message as "From [email protected] on behalf of [email protected]". Google lists this as expected behavior. It happens when the message's sending details still point to your Gmail account even though the From line shows the alias.

Sending through the alias provider's own SMTP server usually removes it, because the message then leaves from the domain it claims to come from. Your Gmail address can also leak through automatic replies: out-of-office messages, filter-based auto-responses and full-mailbox notices may all use your original address.

If your alias is affected by the 2027 change#

If you send as a Yahoo, Outlook, Hotmail or other non-Google address through Gmail, your setup keeps working until January 2027. After that it disappears from the From line on the web and in the Gmail apps. Google's notice lists the paths forward.

• Send from the provider's own site or app, such as outlook.com or mail.yahoo.com.
• Use a mail client that connects to the other account over IMAP/SMTP, so it sends as itself instead of through Gmail.
• Use the Gmail app on Android, iPhone or iPad, which can still add non-Google accounts directly over IMAP.
• For a business domain, move the domain's mail to Google Workspace so the address becomes Google-hosted.
• Keep receiving in Gmail by setting up auto-forwarding at the other provider. Forwarding isn't part of the change.

A faster way to manage aliases across accounts#

The setup above works, but it leaves you checking the From line on every reply, and the 2027 change splits many people's sending across two places: Gmail aliases in Gmail, and everything else somewhere new.

We build AI Emaily, an AI email client that connects Gmail, Outlook and IMAP accounts in one inbox. On a Gmail account it reads your verified Send mail as list and preselects the alias a message was addressed to when you reply. A Yahoo or Outlook account that loses send-as can be connected directly and send as itself. The limit: AI Emaily can't bring third-party send-as back inside Gmail, and it only uses aliases Gmail has verified. AI drafts wait for your approval before anything sends.