Mail Server Settings

Mail Server Settings

I'm having an issue with the Mail Server Settings for Incoming Mail. I have a question about the ServerName/IPAddress, I have put the correct IP and tried the Server Name with no go. We use SMTP on port 25, and I have created a Help Desk User in AD and an Exchange Mailbox, and I keep getting same error: FAILURE :Email Settings saved successfully. But error occurred while trying to check connection with mail server - Problem connecting to mailbox. Any thoughts?

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