the 's' where it is run means the binary is setuid, it means when you run the binary regardless of what user you are, it will run the binary as that user (in this case root).
This is normal for example on a lot of default installs for sendmail (or something runing as sendmail in compatibility mode (symlinked)).
I don't use/install the sendmail wrapper that comes with courier, but I would expect it to be similar.
If you are sysadmin a system with MTA etc. It is advisable to learn about system permissons, things like setuid, setgid and sticky bits all play their part and should be understood.
Ricky
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