-borg-, you can determine whether or not this should be posted due to the legality issues in the US and Europe.... I had the same issue in needing to send an email to a group (in our case, Technical Services) whenever a post was made in specific areas of our forum.

(All line references are approximations)

Sending email to a group by Category

Line 106 ADD
Dim intCatID   'Holds the cat ID

Line 108 ADD
intCatID = trim(Request.Form("cat"))

Line 1116 ADD (right after the two end if's)
'******************************
'***   Send Email Notification #2   ***
'******************************
strUserEmail=""
Select Case intCatID
  '2 = Category 1
  '3 = Category 2
  '4 = Forum Rules
  '5 = Internal Use Only
  Case "2"
    strUserEmail="group1@mydomain.com"
  Case "3"
    strUserEmail="group2@mydomain.com"
  Case "4"
    strUserEmail="group1@mydomain.com"
  Case "5"
    strUserEmail="group9@mydomain.com"
  Case Else
    strUserEmail="admin@mydomain.com"
End Select
if strUserEmail<>"" then
  strEmailMessage = "*** TECH SERVICE EMAIL ***" & _
  "<br /><br />" & strTxtEmailClickOnLinkBelowToView & " : -" & _
  "<br /><a href=""" & strForumPath & "/forum_posts.asp?TID=" & lngTopicID & "&PID=" & lngMessageID & "#" & lngMessageID & """>" & strForumPath & "/forum_posts.asp?TID=" & lngTopicID & "&PID=" & lngMessageID & "#" & lngMessageID & "</a>"
  'If we are to send the post then attach it as well
  If blnSendPost = True Then strEmailMessage = strEmailMessage & "<br /><br /><hr />" & strPostMessage
    blnEmailSent = SendMail(strEmailMessage, decodeString(strUserName), decodeString(strUserEmail), strMainForumName, decodeString(strForumEmailAddress), decodeString(strEmailSubject), strMailComponent, true)
  end if

/include/message_form_inc.asp

Line 66 ADD
 <input type="hidden" name="cat" value="<%=intCatID%>">

*edit: corrected my case statement... had a little PHP syntax mixed in