i also found this at support.microsoft.com
Microsoft Knowledge Base Article - 299506
OL2000: Messages That Contain an Attachment Stay in the Outbox
View products that this article applies to.
This article was previously published under Q299506
SYMPTOMS
In Outlook, if you attempt to send a message that contains file attachments, the message may remain in the Outbox even though you click Send/Receive.
In Outlook Express, if you attempt to send a message that contains file attachments, you may receive the following error message:
Error 0x800ccc13
Socket write error
CAUSE
This behavior can be caused by an Internet filtering program, for example, Net Nanny.
RESOLUTION
To resolve this behavior, reconfigure the Internet filtering program to allow attachments. If that is not possible, either deactivate or remove the filtering program.
To deactivate the Net Nanny program:
On the Windows taskbar, right-click the Net Nanny icon, and then click Deactivate.
When the Net Nanny program prompts you for the administrator password, type the password, and then click OK. The color of the Net Nanny icon in the status area changes to blue, indicating that the Net Nanny program is deactivated.
To view information from the Net Nanny User Guide, visit the following Net Nanny Web site:
http://www.netnanny.com/home/support/kb/docs/prod_NN4_UserGuide.pdf
