Вы можете просто использовать ниже подпункта.
Sub WriteEmail()
On Error GoTo HarunErrHandler
Sheets("ABC").Range("M1") = "abc@hotmail.com"
Sheets("ABC2").Range("M1") = "abc2@hotmail.com"
Exit Sub
HarunErrHandler:
MsgBox "No such sheet found.", vbInformation, "Info"
'MsgBox("Error Number: " & Err.Number & vbCrLf & Err.Description, vbCritical, "Error")
End Sub