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When testing a site on a Vagrant box or with a local setup (MAMP) for a client or their users, you want to make sure that you don't send out e-mails to clients from your testing environment. Drupal has a module for this, namely Reroute email which can be used for this, but you need to make sure to enable and configure this module every time you overwrite / import the database.

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I use Vagrant for development and testing of server setups and sites. Which is a very handy way of working, but with the more frequent releases of Virtualbox it's getting harder and harder to keep the Virtualbox Guest additions up-to-date.