The critical detail is the port number: use port 587 for STARTTLS encryption, which is the modern standard. com 587` should result in a connection response from the server, often represented by a 220 code banner.
Secure Email Route: Configuring Outlook SMTP Server Settings
If you are using a Microsoft 365 business account, the same address applies. The authentication method should always be set to "Logon using Secure Password Authentication (SPA)" or standard username/password to match your credentials.
You may need to contact your IT department to whitelist the port or adjust router settings to allow external SMTP traffic. If the test fails, the issue is likely network-level rather than a mistake in your email address or password.
Configuring Outlook SMTP Server for Secure Email Delivery
Mixing these up is a frequent cause of the "sending failure" error. POP3 and IMAP Comparison For receiving mail, Outlook uses either POP3 or IMAP.
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