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POP/IMAP/SMTP Email Settings for Office 365


If you’re connecting to your Office 365 email in a client which does not support Office 365, please use the following settings for configuring your email account:


Server name


Encryption method


995 implicit

TLS* v1-1.2


993 implicit

TLS* v1-1.2


587 explicit

TLS v1-1.2

* Some clients refer to implicit TLS as SSL.

In addition, use the following username and password:
  • Username: Your OU e-mail address
  • Password: Your OUNet password

Authentication settings: If the program allows you to set up advanced settings, use the following:

  • Select the outgoing server requires authentication option.
  • Select the setting that lets you use the same user name and password for sending email.
  • Don't select the setting for Secure Password Authentication.

Thunderbird Configuration:

Incoming Server:
Server name:
Port: 993
Encryption method: SSL

Server name:
Port: 587
Encryption method: TLS

SMTP Update

As of June 1, 2018, there will be a limit of three concurrent connections per mailbox when sending emails using the SMTP Authenticated Submissions client protocol. This non-proprietary protocol is used to send email by legacy email clients, third-party software and services, and devices such as multi-function printers. Also, sent emails will now be stored in the Sent Items folder.
When this change is implemented, multiple legacy email clients, devices, or applications may no longer be able to send emails at the same time and may experience temporary errors forcing them to retry. This change will, most likely, impact mailboxes which send a large amount of emails. This change does not impact Outlook clients.
If you are impacted by this change, you have a few options:
  1. Use a different mailbox per application or device.
  2. If you are trying to send out bulk emails (such as a newsletter to employees) in parallel to using a 3rd party application, you may have to send it out in batches or use distribution lists.
  3. If time is important, such as with an alerting system that could generate multiple alerts at the same time, you will need to use a third-party email delivery service that is designed to send out large amounts of emails.

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