Application.MailSession property (Excel)
Returns the MAPI mail session number as a hexadecimal string (if there's an active session), or returns null if there's no session. Read-only Variant.
expression A variable that represents an Application object.
This property applies only to mail sessions created by Microsoft Excel (it doesn't return a mail session number for Microsoft Mail).
This property isn't used on PowerTalk mail systems.
This example closes the established mail session if there is one.
If Not IsNull(Application.MailSession) Then Application.MailLogoff
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