Sandbox User Email Addresses Modified on Refresh

Starting in Spring ’14, whenever you refresh a sandbox all user email addresses are modified to use an example domain. The Salesforce message transfer agent ignores emails that end with @example.com, so no emails are sent from a sandbox.
Available in: Enterprise, Performance, Unlimited, and Database.com Editions

Any time the sandbox is refreshed, users who want to continue receiving sandbox emails must modify their email address.

Before Spring ’14, sandbox email addresses used the following format:

email@domain.com.sandboxName

Starting in Spring ’14, sandbox email addresses are automatically updated to use the following format:

email=domain.com@example.com

For example, if your email address is awheeler@universalcontainers.com.sandbox, upon refresh that email address will be:

awheeler=universalcontainers.com@example.com