On Wed, 27 Nov 2019 17:00:26 +0100 Tobi <jahli...@gmx.ch> wrote: > > Issue could occur if trusted/internal networks is not set properly and > the message contains a non-smtp received header with a public IP. Like > for example could occur if the message is sent via lmtp. Then the > received header does not contain ptr info therefore _LASTEXTERNALRDNS_ > cannot be set or only set with empty string. That could potentially > lead to fancy dns queries if using the tag in an askdns rule
AskDNS is supposed to skip empty or undefined strings.
