Every time I set up a box our DNS and network trips me up. Intelliware doesn’t publish an MX record with a local address to the internal lan. So Sendmail tries to connect to our external address, and nothing happens. The answer is to explicitly relay through our mailhub using a Sendmail SMART_HOST.
I’m starting with a minimal RedHat EL 4 installation:
You need to install the sendmail macro package.
# rpm -Uvh sendmail-cf-8.13.1-2.i386.rpm
Then add the SMART_HOST definition to the sendmail.mc file.
# cd /etc/mail # vi sendmail.mc
You will find a section like this
dnl # Uncomment and edit the following line if your outgoing mail needs to dnl # be sent out through an external mail server: dnl # dnl define(`SMART_HOST',`smtp.your.provider')
Edit the provider and uncomment it
dnl # Uncomment and edit the following line if your outgoing mail needs to dnl # be sent out through an external mail server: dnl # define(`SMART_HOST',`mailserver.intelliware.ca')
Run make from /etc/mail
# pwd /etc/mail # make
# service sendmail status
Note: this will only allow email to Intelliware addresses. If you need to send mail to external addresses (e.g. customers), you will need to allow relaying from this machine.