POP3 Mail Setup in Outlook client.

Phurba Tshering Gurung 21 Reputation points


We have an customer where they have hybrid configuration between office 365 and Linux mail server.

  • MX pointed to Linux mail Server.
  • They have several users migrated to office 365 with forwarding from Linux and connectors from office 365.

They wanted to setup POP3 in Outlook application using below configuration where they wanted to use office 365 as incoming mail server and Linux mail server as outgoing mail server.

Setting Type: POP3
Incoming Server: outlook.office365.com
Port: 995
Type: SSL

Outgoing Server: mail.contoso.com
Port: 25
Type: Auto

But not working. Please request an suggest for the issue.

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Oscar Maqueda 526 Reputation points Microsoft Employee

    Hi are you sure that port 25 in outgoing server is enabled ? give a try to port 587 or port 465