Unfortunately, the Registry is changed to solve the problem that WINXP cannot send emails.

In the LAN, email is frequently used by people. However, due to factors such as the system platform, networking mode, and topology of the LAN, data transmission may fail, the email and its attachments cannot be normally sent. Some workstations in the company's lan use the WINXP system, but they cannot send emails all the time, which seriously affects the effective use of the LAN. If it cannot be solved, therefore, each machine with a WINXP system can only reinstall Win98 or other systems, which will cause a lot of repetitive work and waste of resources. After our efforts, we finally found a solution.

The following uses the WINXP system as an example to describe how to modify the Registry to smooth the network and send emails normally. Our local area network accesses the Internet using a downlink asymmetric transmission method that connects satellites. Using WinRoute as the agent software, multiple computers in the LAN share the directpc connection. Due to the mismatch between the expected data packet size of directpc and the data packet size sent and received by the client, the client receives data and cannot send emails. To send an email, modify the WINXP registry as follows: "HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ Tcpip \ Parameters \ Interfaces \{...} \ MTU ", {…} under Interfaces {...} You need to determine which branch is the corresponding Nic. Generally, this includes the local IP address or gateway. In the WINXP registry, each branch has a large amount of content and needs to be carefully identified. It must correspond to the network settings of the server. Find the branch and create the DWORD type key "MTU". The value is in decimal number "1466 ". After the modification is complete, restart the machine to send the email normally. There is no problem with attachments.

In addition, the master server registry should be modified accordingly. If other clients use other Windows systems, modify the Registry to enable normal mail sending. For more information, see:

Win2000

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ Tcpip \ Parameters \ interfaees \{...} \ MTU (DWORD Value: 1466) winnt

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ "ejthernet_adapter" \ Parameters \ Tcpip \ MT (DWORD Value: 1466) Win98/me

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ class \ nettrans \ ooox (X may be 0, 1, 2 ......) Maxmtu (string value: 1462)

You also need to confirm the branches and then modify them. After modification, the client host can send emails and attachments. If a new MTU value is created for the server registry, the client MTU or maxmtu value should not be greater than the server value (if any ). The value range can be modified according to the actual situation to achieve the best matching rate. After the modification is successful, export the registry for backup.