The image one is the simplest and that's what the OP wants.
I personally use email forms that are posted to a C# page that will then send the email to you from the server. And bots can't get at code running on the server.
That certainly isn't the simplest way! Plus it has the draw back that if they enter their email address incorrectly, you won't be able to get back to them.
Of course you'd validate the email address they enter first, but that won't guarantee it.... You can't help it if people are too stupid to enter their own email address correctly...