how can i sent mail to extern from owcserver?

Here is my network design. I would like to send mail to extern from my owncloud server which is im dmz network.
intern from my owcserver i can sent mails but extern cant. under my owcserver mail configuration pointed to intern exchange server .
  "mail_smtpmode"     => "smtp",
  "mail_smtphost"     => "mx1.domain.local",
  "mail_smtpport"     => 25,
  "mail_smtpauth"     => true,
  "mail_smtpauthtype" => "LOGIN",
  "mail_smtpname"     => "username",
  "mail_smtppassword" => "password",

mynetwork
apollo-13Asked:
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ArmenioCommented:
Own cloud is not a mail relay.  

You need to allow relaying of mail via the exchange server.
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apollo-13Author Commented:
how can i do that? i installed owncloud under windows 2012 server
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ArmenioCommented:
You have two options.  (these are my opinions  but are not strictly secure)

option1
set up a open relay and lock it down to the server running own cloud in exchange.and relay via the exchange server
http://www.petenetlive.com/KB/Article/0000542.htm

option 2
install the smtp service role and configure this to send emails. you may need to open firewall ports to send, depending on your config.

option3
use your isp to relay the mail form the server  ( contact your ISP get their mail server details and find out if they allow relaying from with in their network. ( this may be blocked as spam. however i have very good success with this set up.)
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apollo-13Author Commented:
thanks
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