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reducing the mail transfer agent footprint

Posted 05-31-2011 at 09:39 AM by neonsignal

For systems with minimal memory, the mail transfer agent exim4 may not be required (since these days, email is often handled by an upstream provider rather than locally).

There still needs to be a relay agent, so this is where esmtp-run comes in. Installing it will remove the exim4 daemon.
apt-get --purge install esmtp-run
This will provide local mail delivery, but the hostname in the configuration file /etc/esmtprc can be edited to allow delivery through an ISP (for example, if a script needs to send email).
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