How to search sent mails in specific date from Exchange 2010 SP3

[hongwoo_jin]

Anyone who know how to search emails sent all external users in specific time from Exchange Server 2010 SP3?

I am now trying to make powershell with both get-mailbox and search-mailbox , but even if I use search-mailbox's searchquery, I am now sure what option do I make it?

I've already multi mailbox search in ECP, but the screen is limited, so it is hard to make results which I want?

[#2]

Are Message Tracking logs not an option for your scenario, as you cannot use search with wildcarded To condition, search cannot distinguish between internal/external origin, and despite tracking's limited life span. E.g. something like
Get-ExchangeServer | where {$_.isHubTransportServer -or $_.isMailboxServer} | Get-MessageTrackingLog -ResultSize Unlimited -EventID Receive | Where {$_.Source -eq 'STOREDRIVER' -and $_.Recipients -inotlike '*@<contoso.com>'}

You can query the MessageIDs from those messages, and use those for further investigation.