[Buildbot] #3183: fix network "spottiness" on new infra

[Buildbot trac]

#3183: fix network "spottiness" on new infra
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Reporter:  dustin    |       Owner:
    Type:  defect    |      Status:  new
Priority:  critical  |   Milestone:  sys - other
 Version:            |  Resolution:
Keywords:            |
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Comment (by dustin):

 mail's going over the internal network:
 {{{
 smtp_server = 192.168.80.235
 }}}

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Ticket URL: <http://trac.buildbot.net/ticket/3183#comment:15>
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