Determine if sending from specific mailbox - vba

Question

I would like add an acronym of my name at the end of the mail subject if sending it from a specific mailbox.
Example:
I have two mailboxes in Outlook, mail1#mail.com and mail2#mail.com.
When sending mail from mail1#mail.com the code should check if the acronym is present in the subject, if not add it.
Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)
Dim xText As String
'text I would like to add at the end of mail subject
xText = "/MX"
If oAccount = "mail1#mail.com" Then 'part which does not work
If InStr(Item.Subject, xText) = False Then
Item.Subject = Item.Subject & " " & xText
End If
End If
End Sub

Answer 1

You should get the result required with .SendUsingAccount rather than Account.
Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)
Dim xText As String
If Item.Class = olmail Then
'text I would like to add at the end of mail subject
xText = "/MX"
Debug.Print Item.SendUsingAccount
If Item.SendUsingAccount = "mail1#mail.com" Then
If InStr(Item.Subject, xText) = False Then
Debug.Print Item.Subject
'If item cannot be edited post another question
End If
End If
' for testing, cancel ALL sending
' remove to allow sending
Cancel = True
End Sub