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Setting Up Alternative Email Clients


  • Some non-mobile clients can use the ActiveSync protocol.


  • Use the IMAP4 setting below.
Type of server Server name Port Encryption method
POP3 (incoming mail) 995 TLS
IMAP4 (incoming mail) 993 TLS
SMTP (outgoing mail for both POP and IMAP clients) 587 STARTTLS

You must ensure that secure connections are selected for both incoming mail and for outgoing mail.


If you use Thunderbird and other IMAP clients, you may encounter data throttling errors. This will prevent the initial sending and receiving of email for periods of time. If your IMAP connection to Nexus365 is being throttled you are advised to use the web browser client (OWA), while leaving the IMAP client to complete data synchronisation. The throttling rate is controlled by Microsoft and can’t be changed by IT Services.

For faster sending, set the sendinbackground value to True.

IMAP4 is preferred over POP3 because it is more sophisticated and better supports larger mailboxes with multiple folders. Your mailbox can only be accessed via secure connections. Your mail client must support IMAP through SSL connections.

Exchange Web Services (EWS)

You can use this service to enable Nexus365 calendars in Thunderbird as well as adding Exchange functionality to other clients.

A calendaring add-on is available here:

Configure it to use Exchange Web Services (EWS) and this URL, which (when visited and authenticated) can also be used to generate a service for connections:

As with other clients, the username format is your SSO followed by @OX.AC.UK (which is case sensitive and should be in CAPITALS: unitxxxx@OX.AC.UK).

Written by IT Services. Latest revision 8 August 2019