Your mailbox is a full Microsoft 365 account. Sign-in details arrive by email when it's provisioned.
Webmail
The fastest way in: outlook.office.com. Sign in with your full email address as the username. Nothing to configure and it works on any device.
Outlook, Apple Mail and phones
Modern clients discover the settings automatically. Add an account, enter your full email address and password, and let it configure itself.
If you're prompted for manual settings, use:
| Setting | Value |
|---|---|
| Incoming (IMAP) | outlook.office365.com, port 993, SSL/TLS |
| Outgoing (SMTP) | smtp.office365.com, port 587, STARTTLS |
| Username | your full email address |
| Authentication | OAuth2 where offered, otherwise your password |
Use IMAP rather than POP3 unless you have a specific reason not to. POP3 downloads and deletes, which means mail read on your laptop never appears on your phone.
First things to do
Turn on two-factor authentication. Email is the reset route for every other account you own, which makes it the highest-value target you have. Set it up at aka.ms/mfasetup.
Set your time zone, or every meeting invite you send will be wrong. Settings → General → Language and time.
Add a signature under Settings → Mail → Compose and reply.
Automatic setup keeps failing
Almost always DNS. Microsoft 365 needs an autodiscover record:
| Type | Host | Value |
|---|---|---|
| CNAME | autodiscover | autodiscover.outlook.com |
If your domain's DNS is with us this is already in place. If you moved DNS elsewhere, add it there.
Mail isn't arriving
Check in this order:
- Junk folder. Obvious, but it's the answer more often than not.
- MX records. Run
dig MX yourdomain.com +short— it should
return ...mail.protection.outlook.com. If it returns something else, your mail is being delivered somewhere you're not looking.
- Mailbox full. Rare on 365's quotas, but check.
- Rules. A forwarding rule set up months ago and forgotten is a
classic.
Still stuck? Open a ticket with the sender's address and roughly when they sent it. We can trace the message through the delivery logs.
Your mail is landing in other people's spam
Usually SPF, DKIM or DMARC. Read the TXT section of DNS record types, explained, or send us a ticket and we'll audit the three of them for you.