open target mailbox and choose properties
then mail flow settings->delivery options

and add specified user(s) to “send on behalf, grant this permission to:”

source:
http://www.shudnow.net/2007/08/12/send-on-behalf-and-send-as/

update 8/28/13:
it is possible send from a distribution group address. run the following command from the exchange management shell:
Set-DistributionGroup “<dist group>” -GrantSendOnBehalfTo “<user>”
of course the From: field must be visible on the outlook client to send from a different address. for OWA, in exchange 2007 you can’t set the From: field option…this appears to be fixed in exchange 2010+.
source:
http://xyfon.com/tech-tips/send-email-distribution-group/

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