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Merge pull request #21 from huit/ses_support

Initial attempt at SES SMTP support
use the huit fork of evenup/postfix
don't set smtp_relay
Merge branch 'ses_support' of github.com:huit/mediawiki-puppet-build into ses_support
More evenup/postfix hacking fixes conflict

We should not have to manually install Postfix before trying to remove
Sendmail.