[Exim] TLS and root priv

Please see:
<URL:https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=28193>.

With exim running as user mail group mail, exim can't read the SSL
certificate (only readable by root). To quote the reporter,

"Would it be better to read the config, read certificates to memory
first and than change uid/gid to specified in config."

Comments?

Thanks,
Tim.
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