Re: [exim] U=hidden-user need understanding

Thursday 18 May 2006 10:56 skrev Brent Clark:
> I seem to be seeing something in my logs
>
> U=hidden-user
>
> actual line
>
> 2006-05-18 10:29:10 H=(cpt.proteahotels.com) [66.8.31.51] U=hidden-user
> F=<karen@???> temporarily rejected RCPT
> <myuser@???>: host lookup deferred for reverse lookup check
>
> I googled for "U=hidden-user" but alas nothing comes up.

It very probably means that the remote hosts runs an ident server that
replies "hidden-user" when queried. It is nothing to worry about. You can't
trust ident responses from machines you don't control anyway, but they
*could*, in rare cases, help the remote admin track abuse. Set rfc1413_hosts
to turn ident lookups off except for trusted hosts, or rfc1413_query_timeout
to decrease the timeout from the default 30s.

--
Magnus Holmgren
holmgren@???