MS Exchange Server SMTP name for PowerShell script - powershell

Question

If I wamted to send an email from a recently migrated MS Outlook account on MS Exchange Server to a MS Hotmail account on IMAP using PowerShell 5 like this:
$splatr = #{
To = 'her#hotmail.com'
From = 'him#outlook.com'
Subject ='test'
Body ='test'
SmtpServer ='??????'
Port = 587
UseSSL = $true
}
Send-MailMessage #splatr -Credential him#outlook.com
where would I get the Outlook/Exchange Server SMTP name from, please?
If it were the other way around, I would use
SmtpServer ='smtp-mail.outlook.com'
Thank you.

Answer 1

From Outlook,
Start Microsoft Outlook.
Click the "File" tab on the ribbon and then click "Info."
Click the "Account Settings" button and then select "Account Settings."
Select the account for which you want to look up the SMTP information and then click the "Change" button.
Look in the field next to "Outgoing Mail Server (SMTP)" to determine what SMTP server your email account is using.
Click the "Cancel" button to return to the main Outlook window.
Alternative;
Type "nslookup". Your computer's DNS Server name and IP address will
be displayed.
Type "set type=mx" - This will cause NSLOOKUP to only return what are
known as MX (Mail eXchange) records from the DNS servers. For an
example, type "hotmail.com" or use your own domain name.