Do you truly expect to send a file over 2 GB? Most internet connections are
too slow to support such a massive amount of data. Also, most email servers
have a size limit that is much smaller than 2 GB so if Windows Mail does or
does not have a size limit, it would be irrelevant. I tried to look at the
Tech-N-Go's help but the web site has a security problem so I did not look
at the Tngmail.tech-n-go.com page.
The "Internet Message Format" might specify a maximum size for messages; it
is the standard definition of email messages. The standard is at:
http://www.ietf.org/rfc/rfc2822.txt?number=2822
I don't see a GB size specified there but it might be in a standard for
attachments, such as perhaps MIME attachments. You can find all the
standards in ietf.org. They are called Request for Comments (RFCs) but the
approved ones are the standards; that is how the internet works. There are
other ways to look at RFCs, such as at rfc-ref.org.