In particular the DATA (or BDAT) stage configuration; it runs a command and send the headers / data to stdin and receives back the modified message from stdout.

In particular the DATA (or BDAT) stage configuration; it runs a command and send the headers / data to stdin and receives back the modified message from stdout. https://stalw.art/docs/smtp/inbound/data/#content-filters https://stalw.art/docs/smtp/inbound/data/#content-filters