Hi,
Just as you described, because Database Mail does not use the Messaging Application Programming Interface (MAPI), Database Mail profiles are not MAPI mail profiles. Database Mail does not use SQL Mail profiles.
As a workaround, you can install a MAPI client, like Outlook.create a MAPI profile for the SQL Server service account, and then reference that profile for SQLMAIL in SQL Server and SQL Server Agent.
For more information, you can refer:
http://support.microsoft.com/default.aspx/kb/263556/Thanks.
Microsoft Online Community Support
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