Knowledgebase

An operation on a socket or pipe was not performed because the system lacked sufficient buffer space or because a queue was full.
This error indicates a shortage of resources on your system. It can occur if you're trying to run too many applications (of any kind) simultaneously on your machine. If it persists, exit Windows or reboot your machine to remedy the problem.

A connection was forcibly closed by a peer. This normally results from a loss of the connection on the remote socket due to a timeout or a reboot.

See "Socket Error 10053 Software caused connection abort".

A connection abort was caused by the server or some software in between (e.g. firewall, proxy). Turn off any proxy (check if your antivirus software installed a proxy) and firewall for testing.

This error results of invalid DNS settings. To solve it add the local server's IP to our hosts file (C:\Windows\System32\drivers\etc\hosts):
 192.168.1.5 server
 192.168.1.5 server.domain.local
Then restart "Microsoft Frontend Transport" and "Microsoft Exchange Transport" services.

The "451 4.7.0 Temporary server error" in Exchange Server usually indicates a DNS configuration issue. Here are the steps to resolve it:

1. Check DNS Configuration:

   • Ensure that your Exchange Server is using the correct DNS servers.
   • If you have only one domain controller, avoid setting a router as the secondary DNS server. Instead, use the internal DNS/Domain Controller.

2. Remove Secondary Public DNS:

• In a typical production environment, a secondary public DNS server should not be configured. The internal DNS servers should handle all forwarding.

By following these steps, you can address the DNS-related issues that might be causing the temporary server error in Exchange Server.

Please ensure that the Exchange SMTP receive connector allows anonymous sending of emails, this is important for incoming emails. And please turn off SMTP authentication in the SmartPop2Exchange SMTP configuration if the problem persists and it is turned on.

Your Exchange/SMTP server is not configured to receive mail for yourdomain.com. From your Windows Start Menu, select Start | Programs | Microsoft Exchange | System Manager. There select: Recipients | Recipient Policies | Properties. Click on the "email Addresses" tab, under Generation rules, select SMTP, and then click Edit and change the value to "@yourdomain.com". Please also make sure that the email addresses of all users are specified in their Active Directory entries on the "email Addresses" tab.

"unable to relay..." means your SMTP server does not allow SmartPOP2Exchange to send mail to it (as a SMTP relay server). Please first check the entered mail addresses in the "SMTP settings" of SmartPOP2Exchange. Make sure that these addresses also exist on your SMTP server. If you like your SMTP Server to send/forward that mail to an external server then set your SMTP server to allow all SMTP relays or at least relaying from SmartPOP2Exchange. (For MS Exchange Server you will find this setting in the properties of the "virtual SMTP server")

This notification is typical for Exchange Server 2007/2010 because they both have a standard option limiting email sizes to 10MB. These can be modified by changing the limitations of the Receive Connector. This occurs over the Powershell: Help article at Microsoft  (Set-ReceiveConnector  --->  MaxMessageSize)