You have a legacy application that needs to send email to employees.
The legacy application runs on a client computer that must send email by using SMTP through Exchange
Online.
You need to identify the correct host name and port information.
Which settings should you use?

A.
Outlook.office365.com and port 25

B.
Outlook.office365.com and port 587

C.
Smtp.office365.com and port 587

D.
Smtp.office365.com and port 25

Explanation:

The legacy applications would use port 25 for smtp. The host name should be Smtp.office365.com.