TSL or TLS - Come on Ed !!!
Quote : The company reports that, because other providers do not always support Transport Security Layer (TSL) encryption, currently as much as 50 per cent of incoming messages and 35 per cent of outgoing mail was transmitted in the clear, even though Gmail itself supports TLS in both directions.
SO.. lets stick with TLS, a quick google (sic) search for "Transport Security Layer " only returned pages on TLS not TSL