Easiest way to determine if SMTP server is using encryption?

[Mikoyan]

Hi all,

We use email relays locked down to specific IP addresses however want to confirm if emails are being relayed using encryption...

Using MXToolbar it says that: MTP TLS OK - Supports TLS.

However when entering our details into devices such as printers we are not using any authentication and just your bog standard Port 25, etc

Whats the easiest way to determine if encryption is being used when sending over the relay?

 

[Caged]

If you aren't telling the printer to use TLS then it won't be. For the very few devices that I have that are old enough or badly coded enough to not support it I have one of the on-site Windows servers set up as an SMTP relay which keeps the communications between that and Google's SMTP (we use Google Apps, enforce TLS on the relay and whitelist our IP address) secure.