> I developed a S/MIME signing milter that can be used with Postfix. It 
> features a simple map file, where you can define email addresses and 
> corresponding certs/keys. If a mail arrives, the milter checks the MAIL FROM 
> address and looks up the map file. If it finds a record, it signs the mail 
> with S/MIME.
> 
> The milter is written in C++ (14. Probably 11 will work as well).
> 
> I tested it on Mac OS X and Gentoo Linux. Readmes and Man-pages are included. 
> Feel free to give it a try:
> 
> https://signing-milter.org (Thanks to Andreas Schulze for the home)
> 
> Code: https://github.com/croessner/sigh

I forgot: The name "sigh" is an idea from Patrick Ben Koetter.

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Attachment: smime.p7s
Description: S/MIME cryptographic signature

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