Hello,

It seems that in Settings-> security -> Whitelist "SMTP Auth Bypass" also disables message sniffer

the helppage does not indicate this:

My problem is as follows: i have a mailgateway (Proxmox mail gateway) who sends incoming mails to smartermail, as there are also other servers using our domain i have to select the "SMTP Auth Bypass" else i will get "550 Authentication is required for relay" fails but this seems to also skipt "message sniffing" (at least in this case i have 0 mails passed in the reporting page).