Here's the relevant settings from my OE6 (although it should be pretty much the same for OE4, OE5 and OE5.5

General Tab
Send and recieve messages at startup
Check for new every 8 minutes
OE set as default mail handler

Send Tab
Send messages immediately

Spelling Tab
NOT CHECKED Always check spelling before sending

Connection Tab
NOT CHECKED Hang up after sending and receiving
OE shares your Internet Connection (the connection is set to auto connect)

Other than that I'm not sure why your OE is only sending the first email.

>I try your code example, but still only the first mail sent and the second, or any third, fourth mail will stay in the InBox folder. My PC is Win98SE, VFP5.0a, Outlook Express 5.5, 56kb modem dialup connection. I have try checking the setting under Tool->Options->Send in Outlook Express, but it seen nothing to do with the problem. Is it any other possibly that cause the problem?