I am running Exchange 2007 on windows 2003 server (no Edge transport) I have started the pop3 service, users can send and recieve e-mail to each other using pop3 on our exchange server, but cannot send externally i keep getting a undeliverable 550.5.7.1 unable to relay message, I have checked the default receive connector on the HUB Transport server configuration and the anonymous users radio button in the permission grouptab is ticked. Any ideas I have also noticed in the Mailbox Features tab for the clients i can see Outlookweb access, Exchange Sync, Unified Messageing, Mapi but no POP3 Any ideas why regards Atif

Hi Atif, Do you have a send connector configured to send emails to internet from your hub transport server? Verify as per this article... How to Configure Internet Mail Flow Directly Through a Hub Transport Server http://technet.microsoft.com/en-us/library/bb738138(EXCHG.80).aspx

Hi have already done the send connector as per the site you mentioned and changed the permissions on the receive connector to anonymous. I have noticed that if i add a new accepted domain ( under Organisation Configuration-Hub Transport ) ,and set the radio button to 'External Relay Domain.E-mail is relayed to an e-mail server outside this exchange organisation ..' then the e-mail get sent out. But this is not how i want it to work, i will be adding domains forever like this. Help

Hi, In most times, the issue is caused by the improper permission. Please check the following configuration in your receive connector and test the issue again. Server Configuration--Hub Transportreceive connectorsclient <your server name>--permission group tab---check Exchange user and uncheck all other tabs Server Configuration--Hub Transportreceive connectorsclient <your server name>--authentication tabcheck Basic authentication, Integrated Windows authentication and transport layer security. If the issue persists, please run the following cmdlet and paste the result here. Get-receiveconnector |fl Thanks, Elvis

he is the output [PS] C:\Documents and Settings\Administrator>[PS] C:\Documents and Settings\Administrator>Get-receiveconnector |fl AuthMechanism : Tls, Integrated, BasicAuth, BasicAuthRequireTLS, ExchangeServerBanner :BinaryMimeEnabled : TrueBindings : {0.0.0.0:25}ChunkingEnabled : TrueDefaultDomain :DeliveryStatusNotificationEnabled : TrueEightBitMimeEnabled : TrueDomainSecureEnabled : FalseEnhancedStatusCodesEnabled : TrueFqdn : dcexch.wiz-it.me.ukComment :Enabled : TrueConnectionTimeout : 00:10:00ConnectionInactivityTimeout : 00:05:00MessageRateLimit : unlimitedMaxInboundConnection : 5000MaxInboundConnectionPerSource : unlimitedMaxInboundConnectionPercentagePerSource : 100MaxHeaderSize : 64KBMaxHopCount : 30MaxLocalHopCount : 3MaxLogonFailures : 3MaxMessageSize : 10MBMaxProtocolErrors : 5MaxRecipientsPerMessage : 5000PermissionGroups : AnonymousUsers, ExchangeUsers, ExchangeServers, ExchangeLegacyServersPipeliningEnabled : TrueProtocolLoggingLevel : NoneRemoteIPRanges : {0.0.0.0-255.255.255.255}RequireEHLODomain : FalseRequireTLS : FalseServer : DCEXCHSizeEnabled : EnabledWithoutValueTarpitInterval : 00:00:05AdminDisplayName :ExchangeVersion : 0.1 (8.0.535.0)Name : Default DCEXCHDistinguishedName : CN=Default DCEXCH,CN=SMTP Receive Connectors,CN=Protocols,CN=DCEXCH,CN=Servers,CN=Exchange Administrative Group (FYDI BOHF23SPDLT),CN=Administrative Groups,CN=wiz-it,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=wiz-it,DC=me,DC =ukIdentity : DCEXCH\Default DCEXCHGuid : 47e62a80-e3ee-44ab-9b2b-7862e0f0a034ObjectCategory : wiz-it.me.uk/Configuration/Schema/ms-Exch-Smtp-Receive-ConnectorObjectClass : {top, msExchSmtpReceiveConnector}WhenChanged : 19/09/2008 15:26:37WhenCreated : 19/09/2008 14:41:12OriginatingServer : dcexch.wiz-it.me.ukIsValid : True AuthMechanism : Tls, Integrated, BasicAuth, BasicAuthRequireTLSBanner :BinaryMimeEnabled : TrueBindings : {0.0.0.0:587}ChunkingEnabled : TrueDefaultDomain :DeliveryStatusNotificationEnabled : TrueEightBitMimeEnabled : TrueDomainSecureEnabled : FalseEnhancedStatusCodesEnabled : TrueFqdn : dcexch.wiz-it.me.ukComment :Enabled : TrueConnectionTimeout : 00:10:00ConnectionInactivityTimeout : 00:05:00MessageRateLimit : 600MaxInboundConnection : 5000MaxInboundConnectionPerSource : 100MaxInboundConnectionPercentagePerSource : 2MaxHeaderSize : 64KBMaxHopCount : 30MaxLocalHopCount : 3MaxLogonFailures : 3MaxMessageSize : 10MBMaxProtocolErrors : 5MaxRecipientsPerMessage : 200PermissionGroups : ExchangeUsersPipeliningEnabled : TrueProtocolLoggingLevel : NoneRemoteIPRanges : {0.0.0.0-255.255.255.255}RequireEHLODomain : FalseRequireTLS : FalseServer : DCEXCHSizeEnabled : EnabledTarpitInterval : 00:00:05AdminDisplayName :ExchangeVersion : 0.1 (8.0.535.0)Name : Client DCEXCHDistinguishedName : CN=Client DCEXCH,CN=SMTP Receive Connectors,CN=Protocols,CN=DCEXCH,CN=Servers,CN=Exchange Administrative Group (FYDIB OHF23SPDLT),CN=Administrative Groups,CN=wiz-it,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=wiz-it,DC=me,DC= ukIdentity : DCEXCH\Client DCEXCHGuid : 0b67bd01-0fa2-473b-a9e2-5270adafc292ObjectCategory : wiz-it.me.uk/Configuration/Schema/ms-Exch-Smtp-Receive-ConnectorObjectClass : {top, msExchSmtpReceiveConnector}WhenChanged : 19/09/2008 14:41:13WhenCreated : 19/09/2008 14:41:13OriginatingServer : dcexch.wiz-it.me.ukIsValid : True [PS] C:\Documents and Settings\Administrator>

Hi, The receive connectors settings is OK. So we need to confirm if you have set smtp properly in client. In Outlooktoolsemail accountslocate at your pop3 accountsmore settingsout going serverplease check my out going server requires authentication box. Then test the issue again. If you are using Outlook Express, see the following article: Setting Up Mail Servers in Outlook Express http://www.microsoft.com/windows/ie/community/columns/mailserver.mspx Hope this helps. Thanks, Elvis

Hi yes the client outlook settings are fine i have just checked again, I can receive fine but the error still occurs when i send mail, I have rebuilt the exchange server and stil get the same message Help.

Someone ...anyone... please help, More info If I use outlookexpress , i tick the radio button 'Myserver requires authentication', i the go into the 'settings' tab and leave the radio button as ' Use same settings as my incoming mail server'....I get he same error 'unale to relay'. but if i add the credentials of the user in the settings tab 'log on using' everything works , i can send e-mails everywhere . i tried the same in MS outlook and it still fails wierd behaviour

I think i know what the problem is MS Outlook 2003..... I have tested pop3 in outlook 2007 and its works On the Installation you get a choice if your clientsare still usingoutlook2003, I am sure i hit the radio buttion here. Is there any way i can check on this and force exchange to accept connections from outlook 2003, is there any command i can run