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By default Symfony uses Sendmail mail transfer agent to prepare emails to be sent out by the system. If you want to use Exim instead, you need to:

1. Install Exim to your system – please see my Exim on CentOs 4/5
   
2. Configure Symfony to use Exim instead of SendmailEdit (or create if it does not exists) /apps/--app name--/config/mailer.yml and add the following to it:

   
   dev:
     deliver: on
     hostname: mail.yourmailhost.com
     port: 25
   all:
     mailer: exim
   

   Here we are setting Exim to be the default mail agent for all environments plus defining SMTP host name and port for the dev environment.