Public facing isn’t the right term here. It simply means that the authentication requirement to send mail to the distro has been disabled to give anyone anywhere the ability to send an email to it. That makes it publicly accessible. If you want a list of all of the distribution groups that have the authentication requirement disabled you can use this little one-liner.
Open Exchange Management Shell as an Administrator and type the following:
Get-DistributionGroup | ? {$_.RequireSenderAuthenticationEnabled -eq $false} | select samaccountname, grouptype, emailaddress | Export-csv c:\temp\PublicDistros.csv
You can change the last bit to match the directory you want to put your .csv file in.
Hope this helps. Cheers!
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