Hi, I was playing a bit with new proc filters and wrote a very simple filter for rewriting email address in both MAIL FROM command and From header with the specified email address... in just ~60 lines of AWK!
https://github.com/jirutka/opensmtpd-filter-rewrite-from I'm really impressed how simple yet powerful is the new proc filter interface! The fact that you can implement a simple filter in fews lines of such limited language as AWK clearly proves the simplicity. No language-specific API and bindings, no complex formats or craps like gRPC, just plain old processes, stdin/stdout and simple line-oriented protocol with delimiter-separated fields. The proper Unix way. <3 Jakub
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