Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

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Bellsouth and Att Emails error with Destination Unreachable

When sending from our Organization to bellsouth.net and att.net email addresses the mail stops in the firewall and has an error of destination unreachable.  It stays there for several days before finally not delivering.  Bellsouth can email to us just fine, but we cannot reply or start a new email thread.  Has anyone else seen this or might point me in the right direction of what to do?



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