Delay email sent externally but no delay on emails within the domain

I need to delay all  EXTERNAL emails for 5 minutes going out and all emails within the domain to deliver as normal. we are using SBS2011 and the clients are using Office 2013 outlook.
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Tom CieslikIT EngineerCommented:
As far as I know there is no way to set delay on transport hub or any connector in Exchange.

You can stop and start transport service using scheduler (windows task) but this will be like hacking your system and it will stop sending to internal domain also.
Tom CieslikIT EngineerCommented:
Best solution provided, no more other questions from author
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