Commits on Mar 4, 2017

1. Remove attempt to enforce ipv4 in postfix …

   In #420, we added a line to provisioning that attempts to set
   "ipv4" as the only allowed protocol for postfix due to issues in
   how network connections managed the ipv6 connection.
   
   Because the config file does not yet exist during initial
   provisioning, that caused an error message saying as much. See #628.
   
   It turns out that this line hasn't been doing anything. :)
   
   I first went down the path of using `debconf-set-selections` to
   set the protocol value. This works, but then disables ipv6 entirely
   as a valid protocol. Since we haven't heard of any other issues
   besides the original in #420, I think it's safe to not make any
   change here and then watch for any problems.
   
   I have a feeling that postfix has gotten better about this. In the
   documentation for the `inet_protocols` config, it's mentioned that
   "versions before 2.8 attempt to connect via IPv6 before attempting
   to use IPv4."
   
   http://www.postfix.org/postconf.5.html#inet_protocols
   
   Now that we're past 2.8, it's entirely possible that the protocol
   detection has gotten better. If we do run into an issue, there is
   a newer `smtp_address_preference` config that allows us to specify
   which protocol should be attempted first.
   
   http://www.postfix.org/postconf.5.html#smtp_address_preference
   
   In that case, we may need to create our own custom config file as
   it's not entirely obvious that `debconf-set-selections` will work
   for this value.
   
   See #420.
   Fixes #628.

   

   jeremyfelt committed Mar 4, 2017
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