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SMTP (sendmail)

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Install Sendmail

We use the sendmail that comes stock with RHEL.

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Configure Sendmail on usno-serv-* servers

edit /etc/mail/sendmail.mc

• DAEMON_OPTIONS(`Port=smtp,Addr=10.1.34.2,Name=MTA')dnl
• MASQUERADE_AS(`usno.nrao.edu')dnl
• FEATURE(masquerade_envelope)dnl
• FEATURE(masquerade_entire_domain)dnl
• MASQUERADE_DOMAIN(usno.nrao.edu)dnl

Make the sendmail.cf file

cd /etc/mail ; make

Add the internal network to /etc/mail/access

echo "Connect:10.1.34                         RELAY" >> /etc/mail/access
makemap hash access < access

Allow sendmail in TCP wrappers

echo "sendmail:10.1.34.*" >> /etc/hosts.allow

Set sendmail to start up boot up

chkconfig --level 345 sendmail on

Start sendmail manually

/etc/init.d/sendmail start

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Configure Sendmail on diskless nodes

Sendmail checks the space available in /var/spool/clientmqueue. If it thinks it is insufficient it won't send email. Since that directory is in the NFS mounted /, it appears to have no available space. We get around this by linking that directory to /dev/shm which is a shared memory, tmpfs mounted ram disk. This is all done with the /opt/bin/setup_clientmqueue.sh script, called from rc.local, when the node boots. It is only mentioned here for information sake.

Also, configure submit.cf

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Configure Sendmail on other hosts

The node needs to know to what machine to send email and as what domain to masquerade so it will get through.

emacs -nw /etc/mail/submit.mc

• MASQUERADE_AS(`usno.nrao.edu')dnl
• FEATURE(`msp', `[usno-serv-1]')dnl

Make the submit.cf file:

cd /etc/mail ; make

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Configure hosts in Socorro (AOC / DSOC)

Add the following to /etc/hosts on both dropbox (MDA) and revere (MTA)

198.116.24.185  usno-serv-1.usno.nrao.edu
198.116.24.186  usno-serv-2.usno.nrao.edu

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