If you use the Safelist/Blocklist feature, export the list off-box.If you need to revert to the pre-upgrade release for any reason, you can use this file to import the previous configuration. Save the XML configuration file off-box.For confirmation of the upgrade path and appliance provisioning, contact Cisco TAC. Older versions of AsyncOS for Email Security can require more than one upgrade to get to the latest version. Review the compatibility of the ESA and SMA systems before you upgrade. A functional DNS server(s) is required.
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