Sendmail configuration help

[quinton]

This site has a a really good explanation on how to set up and configure sendmail on a linux server.

http://www.linuxhomenetworking.com/linux-hn/sendmail.htm#_Toc109364450

[stephen]

If sendmail-cf not install

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yum install sendmail-cf

# With the newly edited "sendmail.mc" file use make which will call the m4 (the sendmail macro burner) to create "sendmail.cf".

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cd /etc/mail
make


The make will call the m4 macro burner

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m4 sendmail.mc > sendmail.cf

[stephen]

sendmail files
This Linux Home Server site has some explanations of the sendmail configuration

http://www.brennan.id.au/12-Sendmail_Server.html

/etc/mail/access
add your subnet into the access file

# by default we allow relaying from localhost...
localhost.localdomain RELAY
localhost RELAY
127.0.0.1 RELAY
# allow relaying from local PC's
10.10.10 RELAY
cassy@xxx.com.au REJECT

/etc/mail/local-host-names
add your domain into the local-host-names file

# local-host-names - include all aliases for your machine here.
xxx.com.au
mail.xxx.com.au
http://www.xxx.com.au

/etc/mail/virtusertable
in the virtusertable show the mapping of the users email address to the local linux username

emana@xxx.com.au emana
infoa@xxx.com.au emana
johna@xxx.com.au johna
salesb@xxx.com.au emana
johnb@xxx.com.au johnb
kimboa@xxx.com.au kimboa
maca@xxx.com.au macalias
pcb@xxx.com.au pcb
trinab@xxx.com.au trinab
brianc@xxx.com.au brianc
digitalmac@xxx.com.au mac
cassyd@xxx.com.au cassy1

/etc/aliases

#
# Aliases in this file will NOT be expanded in the header from
# Mail, but WILL be visible over networks or from /bin/mail.
#
# >>>>>>>>>> The program "newaliases" must be run after
# >> NOTE >> this file is updated for any changes to
# >>>>>>>>>> show through to sendmail.
#

# Basic system aliases -- these MUST be present.
mailer-daemon: postmaster
postmaster: root

# General redirections for pseudo accounts.
bin: root
daemon: root
....
# Person who should get root's mail
# root: stephenx@xxx.com.au
macalias: mac, cassy

[stephen]

This site http://networking.ringofsaturn.com/Unix/sendmailtips.php
has some helpful info as stated

This is a quick document on how to get yourself out of some binds I've run into with sendmail. These aren't going to be the most organized, but I figure someone else may find these useful.

[stephen]

When I send emails they end up in /var/spool/mqueue but are not delivered.

When I type mailq on the server terminal
it lists the mails as being deferred
eg

(host map: lookup (mydomain.com.au) : deferred)

my solution was to check the /etc/resolv.conf file
and make sure the first name server listed was the ip address of my mail server which is also my dns server.

nameserver 10.10.10.183

http://lists.freebsd.org/pipermail/freebsd-questions/2004-March/041322.html

If you have some specific jobs you'd
like to process in the queue, you can skip the rest of the queue processing and handle just those.

sendmail -v -qI {queue id substring}

or

sendmail -v -qS {sender address substring}

or

sendmail -v -qR {recipient address substring}

These variations will limit the processing to a sender address,
recipient, etc, in the queue.

[stephen]

http://www.intermedia.net/support/kb/default.asp?id=899
When I try to send mail to a user on my local linux server called mydomain.com.au ,
an error is displayed in root's email

553: Sorry, that domain isn't in my list of allowed rcpthosts; 5.7.1

solution
edit sendmail.mc
add line

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MASQUERADE_AS(`mydomain.com.au')

save
then type

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make

then restart sendmail

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service sendmail restart

if sendmail-mc is not installed type

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yum install sendmail-mc

prior to make

I get an error that relay access is denied, the system is not configured to relay mail, or that the domain isn't in the list of allowed rcpthosts. Why?