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I am not sure I understand your question correctly but exchange keeps a log of emails for 30 days by default. <br />
Get-MessageTrackingLog <br />
<a href="https://technet.microsoft.com/en-us/library/bb124926(v=exchg.160).aspx" rel="ugc">https://technet.microsoft.com/en-us/library/bb124926(v=exchg.160).aspx</a><br />
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Hope it helps
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I am trying to search all mailboxes for mail with a particular context. Start-mailboxsearch or something similar query to find who send or receive a mail with that content
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Search mailbox with deletecontent is what you are looking for
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I did go through that article before posting but I could not find examples of searching for content in the email body. Most of the examples are for subject which works but does not show any result when I am searching with subject
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Is there a powershell search in Exchange to find which employee registered for a particular domain by using subject name or content of amil and serch through all email between that date and content?
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Is there a powershell search in Exchange to find which employee registered for a particular domain by using subject name or content of amil and serch through all email between that date and content?

Exchange 2013

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.