Joining an organization
Someone invited you to their company's organization on SingleSign? Here's exactly what happens, start to finish. (Setting one up yourself is covered in Getting started as a business.)
1. Open the invite email
Your invite arrives by email and contains a personal join link. Open it — the page says which organization you're joining ("Join Acme Inc. on SingleSign Mail"), who invited you, and the role you'll have.
If the invite went to an address that's already on your SingleSign account, it also appears on singlesign.com under Account → Organizations → Pending invites, with "Accept" and "Decline" buttons.
2. Sign in — or create a SingleSign account
The join page asks you to sign in with SingleSign:
- Already have a SingleSign account? Just sign in — you'll land right back on your invite.
- New to SingleSign? Create a free account as part of signing in. It takes a minute, and afterwards the invite is waiting for you.
3. Accept the invite
Review the details and click "Accept invite". "You're in" — you're now a member of the organization, and colleagues can already find you in people search.
4. Get your company address
Your company address — you@yourcompany.com — is given to you by the organization's admin; there's nothing to claim. When it's assigned you get a notification under the bell and an email — "You've been given you@yourcompany.com at Acme Inc." — and the new mailbox appears in your account menu (click your avatar, top right) the moment it happens. Switch to it there.
Until then, SingleSign Mail still works for you: if you already have a personal @singlesign.com mailbox, carry on using it. If you have no mailbox at all yet, you'll see a short chooser instead of an inbox — "Claim a personal address", "Set up your organization", or "Accept an invitation" — with a note that your organization's admin gives you your company address. A personal address is optional and separate from your company one; you can have both. See Claiming Your Address.
What being a member means
- You get your own company mailbox. It's a separate mailbox — its own inbox, Screener, storage, calendar, and phone setup — that sits beside your personal one under the same sign-in. See Your Accounts & Organizations for switching between them and reading them together under All inboxes.
- The organization owns the company mailbox. Its admins can see how much storage it uses and can suspend, transfer, or delete it — for example when you leave. They cannot read your mail, and your personal
@singlesign.commailbox is never touched by anything the organization does. Details in Company mailboxes. - Colleagues skip your Screener (and you skip theirs) when the organization's "Trust teammate mail" setting is on — it is by default, and every member can see it in Mail settings. Everyone else still waits for your approval. See The Screener for businesses.
- You show up in your organization's people search. Colleagues can find you by name when composing or searching — automatically, with no address book.
- You can sign in with your company address. It works as a SingleSign sign-in alias for as long as you're a member.
- Your role (shown on the invite) determines what you can do in the organization itself — most people are Members. See Admin roles and permissions for what each role means.
On your phone
Each mailbox goes on your phone separately: switch to the company mailbox, open Settings → Phone & apps, create an app password, and add the account with your company address as the username. See SingleSign Mail on Your Phone.
If you leave
When you leave an organization or are removed from it, access to your company mailbox ends right away — the organization keeps the mailbox and its mail. Your account menu shows it as "Acme Inc. — access ended" until you click "Remove" to take it off this browser. Your personal mailbox and any other organizations you belong to carry on as before.
Invite trouble?
- "This invite has expired" — invites only work for a limited time. Ask the person who invited you to send a fresh one; it takes them a few seconds.
- "This invite link is not valid" — the link may have been revoked, already used, or copied incompletely. Ask the person who invited you for a new link.
Last updated: 2026-09-11
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