Paul, we do it all the time with VFP COM called from ASP with the included IIS SMTP server - works good all the time. Demo at http://www.dotcomsolution.com/avfpdemo15/avfpdemo15.asp?action=email1 . Here's some code for it:

************************************************************************

* server :: email

*********************************

*** Function: Send SMTP email using CDONTS. Requires IIS SMTP service running.

************************************************************************
FUNCTION email
LOCAL lcFileName, lcFileDesc
#DEFINE CdoBodyFormatHTML 0 && Body property is HTML
#DEFINE CdoBodyFormatText 1 && Body property is plain text (default)
#DEFINE CdoMailFormatMime 0 && NewMail object is in MIME format
#DEFINE CdoMailFormatText 1 && NewMail object is plain text (default)
#DEFINE CdoLow 0 && Low importance
#DEFINE CdoNormal 1 && Normal importance (default)
#DEFINE CdoHigh 2 && High importance
#DEFINE CdoEncodingUUencode 0 && The attachment is to be in UUEncode format (default)
#DEFINE CdoEncodingBase64 1 && The attachment is to be in base 64 format

lcFileName=THIS.FORM("txtMailAttachment")
lcFileDesc=THIS.FORM("txtMailFileDesc")
oMail = CreateObject("CDONTS.Newmail")
oMail.MailFormat = cdoMailFormatMIME
IF !EMPTY(THIS.FORM("txtMailFrom"))
oMail.From = THIS.FORM("txtMailFrom")
ENDIF
IF !EMPTY(THIS.FORM("txtMailTo"))
oMail.To = THIS.FORM("txtMailTo")
ENDIF
IF !EMPTY(THIS.FORM("txtMailBcc"))
oMail.bcc = THIS.FORM("txtMailBcc")
ENDIF
IF !EMPTY(THIS.FORM("txtMailReplyTo"))
oMail.Value("Reply-To") = THIS.FORM("txtMailReplyTo")
ENDIF
IF !EMPTY(THIS.FORM("D1"))
oMail.Importance = VAL(THIS.FORM("D1"))
ENDIF
IF !EMPTY(THIS.FORM("txtMailSubject"))
oMail.Subject = THIS.FORM("txtMailSubject")
ENDIF
IF !EMPTY(THIS.FORM("S1"))
oMail.Body = THIS.FORM("S1")
ENDIF
IF !EMPTY(lcFileName) .AND. FILE(lcFileName)
oMail.AttachFile(lcFileName,lcFileDesc)
ENDIF
oMail.Send
lchtmlfile = 'email2.htm'
lcHTMLout= FILETOSTR(THIS.cHTMLpath+lchtmlfile)
RETURN oAVFP.mergetext(lcHTMLout)