Ah so.

So - What I really need is to make sure the version of Net::SMTP on the server is a current one so I don't need to worry about the TLS/SSL distinction and write to that.

I should have been more clear, I guess. I'm in the slow process of updating some legacy web software. The 'original' code used Net::SMTP::TLS which was probably a shiny new Module when the code in that section was originally written.

Now, off to rewrite some code using Net::SMTP and not worrying about Net::SMTP::TLS ...