Michael and Viele,
Thanks for your advise. I coded the following and it worked for me. However
teh problem i have is a dailog box is being displayed waiting for my input.
The e-mail is being sent only if i click the YES.  I want to avoid/suppress
this msgbox. If suppression is not possible then i want to code in such a way
that the message box takes a default YES as if i clicked explicitly.

The message/dailog box reads.
"A program is trying to send an e-mail on your behalf.
Do you want to allow this?
If this is unexpected, this may be a virus and should choose NO."

How to suppress this dailog box? (if not atleast how to code so that it
takes YES as my default input)

Again thanks a lot for your time and appreciate your help.

Code that worked:
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Sub Macro3()
Dim oApp As Outlook.Application
Dim oMail As Outlook.MailItem
Dim strContenu As String

Set oApp = CreateObject("Outlook.Application")

Set oMail = oApp.CreateItem(olMailItem)
strContenu = "Email sent"
strContenu = strContenu + Chr(13) + Chr(10) + "next line"

Set myAttachments = oMail.Attachments
myAttachments.Add "C:\Adi\Atlas\atlas-calender.txt", olByValue, 1, "Fichier"

oMail.Body = strContenu
oMail.To = "adi.kondeti@morganstanley.com"
oMail.Subject = "testttttt"

oMail.Send
oApp.Quit
Set oApp = Nothing
End Sub