Hi. I set other server in system/config/email to use DKIM on other server. If i send messages DKIM works, gets pass. But if same message contains a invoice PDF, the DKIM fails. If i manually send same PDF DKIM also works. So in some way, the ispconfig sendsystem have this error: dkim=fail (body hash did not verify). Is this a know bug or any solution available ? The problem is ofcourse that Hotmail and others drop our invoices in a black hole. ISPconfig 3.1.11, Billing 2.0.3 rev 33.