all MTA's have to listen on port 25 to receive from the internet at large. on linux, you have to be root in order to bind to a port number 1023 and below. some programs might choose to then change their effective uid to a non-root user, but all of them will start as root.
Gerry Doris wrote:
I don't believe the latest version of sendmail run as root. That was fixed several releases back.
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