Hello,
There are mail/attachment sending VIs that you can find in the Communications -> SMTP E-mail palette. Generally speaking, the internet toolkit contains palettes for ftp, telnet, url clients, XML parsing, cgi. I suppose you could use an underlying protocol to the SMTP server, TCP perhaps (there is a palette in the communications palette), to access the server to indicate reception... but I think that would require some specific knowledge about what the server expects.
HOWEVER, I think others have used ActiveX containers with Outlook, and thus really use LabVIEW as an ActiveX client to Outlook. The following link to another discussion forum stream indicates that someone has written a VI which does this, and posted at a site they link there; here is the link to the forum stream:
You can also look at the shipping examples (Help -> Find Examples...) in LabVIEW; click the Search tab in the Example Finder when it lauches and searh the word ActiveX. Then double click any keyword in the list to get a list of relevant examples. Also, if you type ActiveX into the search field at ni.com you'll get a number of documents dicussing the use of ActiveX in LabVIEW.
I hope this helps!
Best Regards,
JLS