Email Settings for Office 365


Here are Microsoft's recommended settings for Office 365's email service.



  • Log into your Microsoft email account using a web browser
  • Click the "Gear" toolbar icon in the upper right corner, then click the "View all Outlook settings" link at the bottom
  • Click Mail > Sync email

If you see the Sync email link, then either IMAP or POP has been enabled, but unfortunately, this screen doesn't tell you which service has been enabled, or if both have been enabled. As such, it's possible for you to see, for example, IMAP settings when IMAP isn't actually turned on.

If you do not see the Sync email link, then neither IMAP nor POP has been enabled, and they either need to be enabled by you (if you're the account admin) or your IT administrator.

If you are the admin for this account, you can enable IMAP or POP for Office 365:

  • From the Microsoft 365 Admin Center, navigate to Users > Active users > [select a user] > Mail tab > Email apps > Manage email apps link
  • Select IMAP and/or POP, in addition to Authenticated SMTP
  • Click the Save changes button at the bottom

Incoming Email Settings

IMAP (recommended):

  • User Name — full email address
  • Server Name —
  • Type — IMAP
  • Port — 993
  • Security — SSL/TLS


  • User Name — full email address
  • Server Name —
  • Type — POP
  • Port — 995
  • Security — SSL/TLS

Outgoing Email Settings

  • Server Name —
  • Port — 587
  • Security — STARTTLS (if this doesn't work for you, try SSL/TLS)

Two-Step Verification

If you are using Two-Step Verification, then you must generate an app password for Postbox.

  1. Go to the security settings for your Microsoft account at
  2. Scroll down to the App passwords section (which will only appear if you are using Two-Step Verification), and click on Create a new app password.

    Outlook Two-Step Authentication

 Use this password within the Postbox setup wizard.

Other Important Settings for Office 365 Accounts

Please be sure to check out these help articles:





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