The authentication method should always be set to "Logon using Secure Password Authentication (SPA)" or standard username/password to match your credentials. Troubleshooting Connection Tests Open a command prompt and use the "telnet" command to test the port.
Locate SMTP Server in the Outlook Email Tab
Your SMTP settings for sending do not need to match these ports exactly, but they must point to the correct domain to ensure the email route is logical and secure. If you are using a Microsoft 365 business account, the same address applies.
If port 587 is blocked by your network, you can fall back to port 465, which requires an immediate SSL connection. Understanding SMTP in the Outlook Ecosystem SMTP, or Simple Mail Transfer Protocol, is the standard language email clients use to forward mail to a server for delivery.
Locate SMTP Server in the Outlook Email Tab
For IMAP, the server is imap. You may need to contact your IT department to whitelist the port or adjust router settings to allow external SMTP traffic.
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