Ensure that system scripts can send email
What needs to be done to make sure that system scripts are able to send emails to external email addresses when configured to do so?
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Install a mail server. See How To Install the Send-Only Mail Server "Exim" on Ubuntu 12.04.
Due to the popularity of Gmail, Google Apps, Outlook.com, Yahoo! Mail & a myriad of other providers, many cloud-server users mistakenly fail to install a mail server, initially. However, humans are not the only ones that send electronic mail. If fact, many Linux server applications also need to send email. This tutorial will review how to install a send-only mail server on Ubuntu 12.04.