[GE users] SMTP mail configuration

John Hearns john.hearns at streamline-computing.com
Fri Jul 27 08:43:38 BST 2007

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Chandran, Sathish wrote:
> Can anyone help in setting up SMTP mail configuration in execution 
> hosts. This allows users to send a mail while submitting the jobs.
Errr... yes. But it is my day job :-)

Seriously though, are your exec hosts using Postfix, Sendmail or Exim?
I can give one or two hints for Postfix.
I've also set up Sendmail to do this - which these days to be honest is 
not the pain it used to be.

The basic step is to configured the exec hosts to use the master host as 
a relay host (or indeed if they are directly on a campus LAN just to use 
the campus/company smarthost)    relayhost parameter in Postfix

On the master node, configure to accept email from the exec hosts.
inet_interfaces in Postfix.
You might have to set masquerade_domains
Then set master host to relay mail via campus/company smarthost
relayhost parameter in Postfix

The fun comes if you have a campus smarthost which rejects mail from 
hosts which it cannot resolve. And many clusters have non-resolvable 
internal hostnames (eg nodeXXX at localdomain or nodeXXX at company.com)
You then have to get into the dark arts of masquerading and address 

      John Hearns
      Senior HPC Engineer
      Streamline Computing,
      The Innovation Centre, Warwick Technology Park,
      Gallows Hill, Warwick CV34 6UW
      Office: 01926 623130 Mobile: 07841 231235

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