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Re: Am I really an Open Relay?



Liam Ward wrote:
Kent,

I would assume that you are or at least need to check.

Can you start by telling us which MTA you are using (exim, sendmail, etc.) and a brief description of what you need your Debian box to do with regard to sending and receiving mail.

Sorry; thought it would've been obvious. I'm using exim.

Basically I use my box as a workstation. I use Mozilla Mail to do most of my mail, using IMAP to the university's mail server (mail.acu.edu). I also have exim running for the intercommunication processes (tripwire reports that get sent to the admin (me), etc). I think I originally selected option 2 during the eximconfig phase of my Debian installation which I believe was to use a smarthost for mail; perhaps I should change it to local delivery only? At any rate, I do remember not specifying relaying, and I think my exim.conf file agrees with my memory (see below).


Here's what I think are probably the relevant snippets from my /etc/exim/exim.conf file:


# Domains we relay for; that is domains that aren't considered local
# but we accept mail for them.

#relay_domains =
# If this is uncommented, we accept and relay mail for all domains
# we are in the DNS as an MX for.

#relay_domains_include_local_mx = true

# No local deliveries will ever be run under the uids of these users
# (a colon- separated list). An attempt to do so gets changed so
# that it runs under the uid of "nobody" instead. This is a paranoic
# safety catch. Note the default setting means you cannot deliver
# mail addressed to root as if it were a normal user. This isn't
# usually a problem, as most sites have an alias for root that
# redirects such mail to a human administrator.

never_users = root

and . . . .


# The setting below allows your host to be used as a mail relay only
# by localhost: it locks out the use of your host as a mail relay by
# any other host. See the section of the manual entitled "Control of
# relaying" for more info.

host_accept_relay = 127.0.0.1 : ::::1

# This setting allows anyone who has authenticated to use your host
# as a mail relay. To use this you will need to set up some
# authenticators at the end of the file

host_auth_accept_relay = *




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