How do I configure exim 3.36 for outgoing mail ?

From: Mark Hobley (markhobley_at_hotpop.deletethisbit.co.uk)
Date: 01/05/05 

Date: Wed, 05 Jan 2005 01:58:22 GMT

I have a computer on my network that I wish to use for outgoing mail. I have
installed the debian package exim 3.36.

How do I configure it for outgoing mail ?

Other computers on the lan are configured with a simple mail transport agent
 (ssmtp) which will forward mail to the exim machine (I believe via the smtp
 port).

My required configuration is as follows:

Thus lan has been configured with a domain name markhobley.yi.org, thus the
mail server (charon) will have a fully qualified domain name
charon.markhobley.yi.org on the lan

The network address is only a lan address and I require incoming email to be
addressed to my real email address which is sent to an ISP provided mailbox,
which is under a different domain name.

Incoming mail is working fine (I do not require any changes at this time).

I need to configure exim on charon to send external mail via the smtp server
provided by my internet service provider.

The external smtp server has an internet address of smtp.blueyonder.co.uk

(I am not sure whether or not authentication is required at this time).

I want to be able to test the ougoing mail using a telnet session to charon.

This is what happens at the moment:

mark@venus:~$ telnet charon smtp
Trying 10.0.0.10...
Connected to charon.markhobley.yi.org.
Escape character is '^]'.
220 charon.markhobley.yi.org ESMTP Exim 3.36 #1 Wed, 05 Jan 2005 00:43:21 +0000
helo venus.markhobley.yi.org
250 charon.markhobley.yi.org Hello venus.markhobley.yi.org [10.0.0.2]
mail from: testout@hotpop.com
250 <testout@hotpop.com> is syntactically correct
rcpt to: mbongo@hotpop.com
550 relaying to <mbongo@hotpop.com> prohibited by administrator

I have not entered any configuration details to make exim aware of my isp
outgoing smtp server.

The file /etc/exim/exim.conf contains the following entries:

# MAIN CONFIGURATION SETTINGS
# I've guessed that the local machine name goes here. I have no idea what
# effect this setting has

qualify_domain = charon.markhobley.yi.org

# I don't understand this bit either. I have left it commented, as this was
# its default setting

# qualify_recipient =

# This was filled in by the installer program. I'm not sure whether this is
# correct.

# Mail is not forwarded to any other machines. All mail should go to
# charon and read via imap.

# maybe this should read
# local_domains = localhost:markhobley.yi.org

local_domains = localhost:charon.markhobley.yi.org

# Allow mail addressed to our hostname, or to our IP address.
# Ok, I don't understand what these settings do.
# Cryptic instruction manuals are not much help to me.
# I have left these settings as default

local_domains_include_host = true
local_domains_include_host_literals = true

# Domains we relay for; that is domains that aren't considered local but we
# accept mail for them.
# What you talking about Willis ?

#relay_domains =

# No local deliveries will ever be run under the uids of these users
# Ok, I don't understand this either. What about system messages being sent by
# daemons (or is it demons ?)
never_users = root

# The setting below causes Exim to do a reverse DNS lookup on all incoming
# IP calls
# I presume that this adds information to mail headers on incoming mail
host_lookup = *

# The setting below would, if uncommented, cause Exim to check the syntax of
# all the headers that are supposed to contain email addresses (To:, From:,
# etc). This reduces the level of bounced bounces considerably.
# I have left this commented as default.

# headers_check_syntax

# Exim contains support for the Realtime Blocking List (RBL)
#rbl_domains = rbl.mail-abuse.org/reject : dialups.mail-abuse.org/warn

# The setting below allows your host to be used as a mail relay by only
# the hosts in the specified networks.
# my lan is 10.0.0.0 with a subnet mask 255.255.255.0
# It's not working Sydney !!

host_accept_relay = 127.0.0.1 : ::::1 : 10.0.0.0

# This setting allows anyone who has authenticated to use your host as a
# mail relay.
# I'm not sure whether I need this. I have left the settings as default

host_auth_accept_relay = *

# I don't use mangled email addresses
# percent_hack_domains=*

# If this option is set, then any process that is running as one of the
# listed users may pass a message to Exim and specify the sender's
# address using the "-f" command line option, without Exim's adding a
# "Sender" header.
# I don't know the full implications of this
# I want messages composed by me to have a sender address of mbongo@hotpop.com
# I want messages from daemons to come from root@machinename or something like
# that so that I can recognise them as system messages from the various
# machines on the lan.

trusted_users = mail:uucp

# If this option is true, the SMTP command VRFY is supported on incoming
# SMTP connections; otherwise it is not.
# I dont know what this does. I will read up on this.
# I have left this as default.

smtp_verify = true

# Some operating systems use the "gecos" field in the system password file
# to hold other information in addition to users' real names. Exim looks up
# this field when it is creating "sender" and "from" headers.
# It would be nice to put email addresses against user names.
# The machines composing the mail are on the lan, not the local machine, so
# I don't know whether this will work.
# I have left this as default. I am still trying to crack the enigma code.

gecos_pattern = ^([^,:]*)
gecos_name = $1

# This sets the maximum number of messages that will be accepted in one
# connection and immediately delivered. Further ones are accepted and queued
# but not delivered.
# I don't know what that means. What happens to queued messages ? When are they
# sent ? I presume that this does not have any effect on the mail client on
# the sending machine.

smtp_accept_queue_per_connection = 100

# Send a mail to the postmaster when a message is frozen.
freeze_tell_mailmaster = true

# This string defines the contents of the \`Received' message header.
# Ok, I'll look at this later.

received_header_text = "Received: \
         ${if def:sender_rcvhost {from ${sender_rcvhost}\n\t}\
         {${if def:sender_ident {from ${sender_ident} }}\
         ${if def:sender_helo_name {(helo=${sender_helo_name})\n\t}}}}\
         by ${primary_hostname} \
         ${if def:received_protocol {with ${received_protocol}}} \
         (Exim ${version_number} #${compile_number} (Debian))\n\t\
         id ${message_id}\
         ${if def:received_for {\n\tfor <$received_for>}}"

# Attempt to verify recipient address before receiving mail, so that mails
# to invalid addresses are rejected rather than accepted and then bounced.

receiver_try_verify = true

# Ok
#accept_8bitmime = true

# This will cause it to accept mail only from the local interface
# Should I uncomment this and set it to 10.0.0.0 ?
#local_interfaces = 127.0.0.1

# If this next line is uncommented, any user can see the mail queue
# by using the mailq command or exim -bp.

#queue_list_requires_admin = false

# The errors_copy line will cause the specified address to receive a copy
# of bounces generated on the system.

#errors_copy = *@* postmaster@yourdomain

#
end

# TRANSPORTS CONFIGURATION
# I have configured local delivery. Incoming mail from my ISP mailbox works.

local_delivery:
  driver = appendfile
  group = mail
  mode = 0660
  mode_fail_narrower = false
  envelope_to_add = true
  return_path_add = true
# file = /var/mail/${local_part}
  directory=${home}/Maildir
  maildir_format = true
  prefix = ""

# This transport is used for handling pipe addresses generated by
# alias or .forward files. If the pipe generates any standard output,
# it is returned to the sender of the message as a delivery error.
# Ok, stick that in your pipe and smoke it. You need to smoke some
# whacky baccy to understand this.

address_pipe:
  driver = pipe
  path = /usr/bin:/bin:/usr/local/bin
  return_fail_output

# This transport is used for handling file addresses generated by alias
# or .forward files.

address_file:
  driver = appendfile
  envelope_to_add = true
  return_path_add = true

address_directory:
  driver = appendfile
  no_from_hack
  prefix = ""
  suffix = ""
# maildir_format

# This transport is used for handling autoreplies generated by the filtering
# option of the forwardfile director.

address_reply:
  driver = autoreply

# This transport is used for procmail
# Huh ? I'm not using procmail.

procmail_pipe:
  driver = pipe
  command = "/usr/bin/procmail"
  return_path_add
  delivery_date_add
  envelope_to_add
# check_string = "From "
# escape_string = ">From "
  suffix = ""

# This transport is used for delivering messages over SMTP connections.
# Does my ISPs server go here ?

remote_smtp:
  driver = smtp
# authenticate_hosts = smarthost.isp.com

end

# DIRECTORS CONFIGURATION

# This allows local delivery to be forced, avoiding alias files and
# forwarding. Ok, my head is hurting. This has been left as default.

real_local:
  prefix = real-
  driver = localuser
  transport = local_delivery

# This director handles aliasing using a traditional /etc/aliases file.
# It gets worse

system_aliases:
  driver = aliasfile
  file_transport = address_file
  pipe_transport = address_pipe
  file = /etc/aliases
  search_type = lsearch
# user = list
# Uncomment the above line if you are running smartlist

# This director handles forwarding using traditional .forward files.
# What is a .forward file ? I need to read about these. Do I need one ?

userforward:
  driver = forwardfile
  file_transport = address_file
  pipe_transport = address_pipe
  reply_transport = address_reply
  no_verify
  check_ancestor
  check_local_user
  file = .forward
  modemask = 002
  filter

# This director runs procmail for users who have a .procmailrc file
# I don't have procmail as far as I know. My mail clients access the mail on
# this machine via imap.

procmail:
  driver = localuser
  transport = procmail_pipe
  require_files =
${local_part}:+${home}:+${home}/.procmailrc:+/usr/bin/procmail
  no_verify

# This director matches local user mailboxes.

localuser:
  driver = localuser
  transport = local_delivery

end

# ROUTERS CONFIGURATION

# This router routes to remote hosts over SMTP using a DNS lookup with
# default options.

lookuphost:
  driver = lookuphost
  transport = remote_smtp

# This router routes to remote hosts over SMTP by explicit IP address,
# given as a "domain literal" in the form [nnn.nnn.nnn.nnn].
# I'm really tired now. What is this ?

literal:
  driver = ipliteral
  transport = remote_smtp

end

# RETRY CONFIGURATION
# I will look at this later

# Domain Error Retries
# ------ ----- -------

* * F,2h,15m; G,16h,2h,1.5; F,10d,8h

end

# REWRITE CONFIGURATION

*@charon.markhobley.yi.org ${lookup{$1}lsearch{/etc/email-addresses}\
                                                {$value}fail} frFs

end

# AUTHENTICATION CONFIGURATION

# This was all commented out

# End of File
# Thank god for that.

Thanks in advance to anyone who can help with this or who can help me to
understand any of this lot.

Regards,

Mark. 

-- 
Mark Hobley
393 Quinton Road West
QUINTON
Birmingham
B32 1QE
Reply to: markhobley at hotpop dot do_not_type_this_bit com
http://markhobley.yi.org/

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