/usr/share/doc/ssmtp/AddHeader is in ssmtp 2.64-5build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | The Addheader patch creates the configuration directive AddHeader.
It adds anything up to newline or '#' to the beginning of mail headers.
You can use a directive in ssmtp.conf like this:
AddHeader=X-security-level: public
I have changed the strtok callss in the read_config to a similarly
looking function, which does not modify the argument string.
I did not, however changed every strtok down the way.
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