Varying-Vagrant-Vagrants/VVV — pull request #420 by zamoose (2014-08-15 21:10:15+00:00)
Title: Disable IPv6 for Postfix

@daveross came across an interesting bug with the default configuration -- since the `inet_protocols` defaults to "all", some network configurations will default to trying IPv6 and then giving up when an MX record won't resolve to it. (Try it yourself -- send to addresses at 10up.com vs. get10up.com). Disabling IPv6 and forcing IPv4 for all smtp connections seems to make this work correctly.