@kofimokome thank you very much for the fast update reflecting my wishes (link filter / custom error message)!
The link filter detects currently all occurrences of https which could lead to false positives, since we use the mail form for software support.
I would like to propose using a regex:
https://stackoverflow.com/questions/6038061/regular-expression-to-find-urls-within-a-string
Ideally it would detect urls starting with http://, https://, fto:// but also urls where the protocol is omitted.
