In 2005, the IRS contracted an email backup service vendor by the name Sonasoft..

In 2009, Sonasoft even sent out a Tweet advertising its work for the IRS.

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IRS sonasoft tweet

The contract is listed as being for “automatic data processing services.” The Sonasoft motto is “email archiving done right,” and the company lists the IRS as a customer. source

IRS sonasoft tweet