Exchange 2007 Beta2 - Allow hub connector to receive unauthenticated SMTP mail

You need to set the permissions to allow Anonymous users to submit mail. This is not in the GUI so you must use the Power Shell.

1. Set the permission:
set-receiveconnector 'Default CHEF' -PermissionGroups:"ExchangeUsers,ExchangeServers,ExchangeLegacyServers,AnonymousUsers"Replace CHEF with your Exchange server name!

2. Verify the permission:
get-receiveconnector | format-listSchema: Microsoft.Exchange.Data.Directory.SystemConfiguration.ReceiveConnectorSchema
AuthMechanism: Tls, BasicAuth, BasicAuthPlusTls, ExchangeServer
Banner:
BinaryMimeEnabled: True
Bindings: {0.0.0.0:25}
ChunkingEnabled: True
DefaultDomain:
DeliveryStatusNotificationEnabled: True
EightBitMimeEnabled: True
EnhancedStatusCodesEnabled: True
ExternallySecuredAsPartnerDomain:
Fqdn: mail.thefoleyhouse.co.uk
Comment:
Enabled: True
ConnectionTimeout: 00:10:00
ConnectionInactivityTimeout: 00:05:00
MessageRateLimit: unlimited
MaxInboundConnection: 5000
MaxInboundConnectionPerSource: unlimited
MaxInboundConnectionPercentagePerSource: 100
MaxHeaderSize: 64KB
MaxHopCount: 30
MaxLocalHopCount: 3
MaxLogonFailures: 3
MaxMessageSize: 10MB
MaxProtocolErrors: 5
MaxRecipientsPerMessage: 5000
PermissionGroups: AnonymousUsers, ExchangeUsers, ExchangeServers, ExchangeLegacyServers, CustomPipeliningEnabled: True
ProtocolLoggingLevel: None
RemoteIPRanges: {0.0.0.0-255.255.255.255}
RequireEHLODomain: False
RequireTLS: False
Server: CHEF
SizeEnabled: True
TarpitInterval: 00:00:05
AdminDisplayName:
ObjectCategoryName: msExchSmtpReceiveConnector
ExchangeVersion: 0.1 (8.0.535.0)
CurrentObjectVersion: 0.1 (8.0.535.0)
Name: Default CHEF
DistinguishedName: CN=Default CHEF,CN=SMTP Receive Connectors,CN=Protocols,CN=CHEF,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=The Foley House,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=thefoleyhouse,DC=ad
Identity: CHEF\Default CHEF
Guid: 0675a1d2-9c19-4068-af33-782d1c27f562
ObjectCategory: thefoleyhouse.ad/Configuration/Schema/ms-Exch-Smtp-Receive-Connector
ObjectClass: {top, msExchSmtpReceiveConnector}
OriginalId: CHEF\Default CHEF
WhenChanged: 01/10/2006 19:58:31
WhenCreated: 30/09/2006 00:19:26
ObjectState: Unchanged
OriginatingServer: chef.thefoleyhouse.ad
IsReadOnly: False
Id: CHEF\Default CHEF
IsValid: True