How to Configure SMTP with Office 365

If you want to send emails using Microsoft Office 365, you need the right SMTP settings. SMTP stands for Simple Mail Transfer Protocol, and It helps your emails go out. Let’s go through what you need to know, step by step.

SMTP Settings for Office 365

Here are the main settings you need to send email using Office 365:

• SMTP Server: smtp.office365.com
• Port: 587
• Encryption: STARTTLS
• Authentication: Yes (use your full Office 365 email and password)

Make sure your account has SMTP AUTH turned on. If not, the settings won’t work.

SMTP Settings for Office 365 Scan to Email

If you’re using a printer or scanner to email documents with Office 365, use these settings:

• SMTP Server: smtp.office365.com 
• Port: 587
• Encryption: STARTTLS
• Authentication: Yes (use a licensed Office 365 email account)

Other things to check:

• Your printer must support STARTTLS.
• Use a real mailbox, not a shared one or alias.
• The "From" address should match the email you log in with.

SMTP Settings for Office 365 Email

To send email from a program like Outlook or Thunderbird:

• Outgoing Mail (SMTP):
  
  • Server: smtp.office365.com 
  • Port: 587
  • Encryption: STARTTLS
  • Login: your Office 365 email and password

If you also need to receive emails:

• IMAP Server: outlook.office365.com
• Port: 993
• Encryption: SSL/TLS

SMTP Settings for Office 365 Shared Mailbox

You can’t log in directly to a shared mailbox to send email. Instead, do this:

• Log in with your own licensed account.
• Use these settings:
  
  • SMTP Server: smtp.office365.com 
  • Port: 587
  • Encryption: STARTTLS
  • Login: your email and password
• Get "Send As" or "Send on Behalf" permissions for the shared mailbox.

SMTP Settings for Office 365 GCC High

GCC High is a special version of Office 365 for U.S. government work. Use these settings:

• SMTP Server: smtp.office365.us 
• Port: 587
• Encryption: STARTTLS
• Authentication: Yes (use your GCC High email and password)

Only use these if you work in or with the U.S. government.

SMTP Settings for Office 365 SSL

If your device doesn’t support STARTTLS and only works with SSL/TLS:

• SMTP Server: smtp.office365.com 
• Port: 465 (if your device allows it)
• Encryption: SSL/TLS
• Authentication: Yes

Note: Microsoft recommends STARTTLS on port 587. SSL on 465 might work, but it’s not officially supported.

Office 365 SMTP Settings Enable

To turn on SMTP for a user in Office 365:

1. Go to the Microsoft 365 Admin Center.
2. Open the user’s settings.
3. Click Mail > Mail apps.
4. Turn on Authenticated SMTP.
5. Save the settings.

The user must have a valid license that includes Exchange Online.

SMTP Settings for Office 365 GoDaddy

If you got your Office 365 through GoDaddy, the settings are mostly the same:

• SMTP Server: smtp.office365.com 
• Port: 587
• Encryption: STARTTLS
• Authentication: Yes: your GoDaddy email and password

Make sure:

• You sign in through the GoDaddy portal.
• SMTP AUTH is turned on.
• Your mailbox has a proper license.

If you run into issues, reach out to GoDaddy support. They may block or limit some features.

smtp.office365.com Not Working

If smtp.office365.com isn’t working, check these common issues:

1. Wrong username or password – Double-check your login details.
2. SMTP AUTH is off – Go to Microsoft 365 Admin Center and make sure SMTP is enabled for the account.
3. Firewall or antivirus is blocking it – Your network or computer security might be stopping the connection.
4. Port 587 is blocked – Make sure your internet provider or firewall allows traffic on port 587.
5. Wrong encryption – You must use STARTTLS. Using SSL instead can break the connection.
6. Unlicensed or inactive mailbox – The account must be active and have a proper license.

If it still doesn’t work, try logging in to your email through Outlook on the web. If that works, the issue is with your app or device settings.

You can also check out our blog,” How to Set up IMAP & SMTP Settings,” for more information. 

Conclusion

Using the correct Office 365 SMTP settings helps make sure your emails are sent the right way. Whether it’s for an email app, a printer, or a shared mailbox. Use smtp.office365.com and port 587 with STARTTLS and always use your email and password to log in. Moreover, for shared mailboxes, send using your own account with permission, and always make sure SMTP AUTH is enabled.

FAQs

1. Can I send emails from a shared mailbox using SMTP AUTH?

Not directly. SMTP AUTH requires a real mailbox with login credentials. But if you’re granted “Send As” rights for the shared mailbox, you can send from it while authenticated as yourself.

2. Is port 25 still supported?

Technically yes, but it’s blocked by many ISPs, and Microsoft frowns upon it. Port 587 with STARTTLS is recommended for anything forward-facing.

3. Do I need a static IP to send via Office 365?

Only if you’re using SMTP Relay with a connector. For SMTP AUTH (the regular way), your IP doesn’t matter as long as authentication is in place.

4. How many emails can I send daily?

There’s a limit of 10,000 recipients per day per user, and 30 messages per minute. If you exceed that, throttling kicks in. Be cool. Spread your emails out.

5. Can I use SMTP if my account has conditional access policies?

Sometimes. SMTP AUTH might be blocked by default if your admin has disabled it org-wide or added strict policies. Make sure it’s allowed for the account you're using.