Excel VBA If Else Statement stops code

In my Excel File I have a CommandButton which sends an E-Mail if cells E1, K2 and K5 are filled.

Unfortunately my code does not really work.

Private Sub CommandButton1_Click()
    Dim OutApp As Object
    Dim OutMail As Object
    Dim nameList As String
    Set OutApp = CreateObject("Outlook.Application")
    Set OutMail = OutApp.CreateItem(0)
    On Error GoTo cleanup

    If Sheets("Sheetname").Range("E1").Value = "" Or _
    Sheets("Sheetname").Range("K2").Value = "" Or _
    Sheets("Sheetname").Range("K5").Value = "" Then
        MsgBox "The Cells E1, K2 and K5 has to be filled!"

        MsgBox "All Cells are filled, send E-Mail now"
        For i = 2 To 22
        If Sheets("efforts and risks").Range("BB2").Value <> "" Then
            nameList = nameList & ";" & Sheets("efforts and risks").Range("BB" & i).Value
        End If
        With OutMail
            .To = nameList
            .Subject = "subject line"
            .Body = "Body Text"
        End With
    End If
    Set OutApp = Nothing
End Sub

If the cells are filled Excel shows the MsgBox, but it does not send the mail. Which part of my code do I have to change?

Hope someone can help me. Thanks a lot