Adding a security group to a distribution list

Doing a massive AD housekeeping task. Just wondered if there was any implication to adding a security group which contains users to a distribution group where they are already added explicitly.

Will this result in the e-mail being delivered twice or is Exchange 2010 clever enough to figure that one out?

Cheers.
tegeniusAsked:
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Gareth GudgerCommented:
Nope. Exchange will enumerate members of all groups before sending. They will only receive the message once.
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tegeniusAuthor Commented:
Cheers.
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