Security information for hostname on Trusty

[Andrew Langhorn]

Hi

I run Ubuntu 14.04 with Postfix installed which uses Amazon SES as a mail
relay. I'm trying to work out why, when a fresh Amazon EC2 instance is
provisioned, I get mail with the subject "*** Security information for
<hostname> ***".

I'd like to know:

- what causes it,
- what use it is to me, and
- how to stop it in the most elegant and efficient manner

A quick Google suggests it might be an outdated version of the Sudo
package, but I'm running the latest available from the Canonical-supported
mirrors in the eu-west-1 region.

Any help anyone can provide is very much appreciated.

Thanks in advance,

Andrew
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