Hi, I have an Exchange Server 2010 SP1 UR 6 in my environment with POP3 and IMAP enable. I have configured a POP3/SMTP Outlook 2010 client and when I download and send messages all goes ok internaly, in my LAN. When I connect from outside I can download (POP3) may emails but I cannot send emails. In Receive Connector Log the message "504 5.7.4 Unrecognized authentication type" appears to me when I am out of my LAN, at home, for example. I have a valid certificate attributted to teh SMTP, IIS, POP Services. In Outlook 2010 configuration tests The SMTP and POP passes; Anyone can help me, please? Thanks for while. Luiz

Hi Luiz, I have some suggestion for you: 1 Restart transport service 2 Enabled "Basic Authentication" on the properties of Receive Connector 3 Set the correct required permissions for "Authenticated user groups" on Receive connector through ADSIEDIT and restart the Transport Service on the Exchange Hub Transport server. Steps: ==== 1. Go to Run and type " ADSIEDIT .Msc" (without quotes) 2. Expand Configuration 3. Expand CN=Services----CN=Microsoft Exchange 4. Expand CN= Administrative Groups--->CN= Exchange Administrative Group 5. Expand CN=Servers---CN=Protocols 6. select CN=SMTP Receive Connectors--- Right Hand Side Window go to the properties of the concerned Receive Connector 7. Select Authenticated user----Checked the attributes (Submit Message to Any Recipient, Submit Message to Server, Accept Authoritative Domain Sender, Accept Any Sender) 8. Restarted the Transport serviceRowen TechNet Community Support

Hi Luiz, I have some suggestion for you: 1 Restart transport service 2 Enabled "Basic Authentication" on the properties of Receive Connector 3 Set the correct required permissions for "Authenticated user groups" on Receive connector through ADSIEDIT and restart the Transport Service on the Exchange Hub Transport server. Steps: ==== 1. Go to Run and type " ADSIEDIT .Msc" (without quotes) 2. Expand Configuration 3. Expand CN=Services----CN=Microsoft Exchange 4. Expand CN= Administrative Groups--->CN= Exchange Administrative Group 5. Expand CN=Servers---CN=Protocols 6. select CN=SMTP Receive Connectors--- Right Hand Side Window go to the properties of the concerned Receive Connector 7. Select Authenticated user----Checked the attributes (Submit Message to Any Recipient, Submit Message to Server, Accept Authoritative Domain Sender, Accept Any Sender) 8. Restarted the Transport serviceRowen TechNet Community Support

Hi Rowen, again, it was problem whith firewall but your instructions were usefull. Thanks a lot. Best Regards. Luiz