Is it possible to send an email link that includes a user's name and password

I use OfficeAutopilot as my preferred email system.
As part of my double opt-in I also ask all new members of my database to register at my website (incidentally, haven't found a way to automate that process yet).

I would like to create new content (posts and pages) in my website, and email the direct URL to my member directory. That's easy enough.

At the moment, members hit the 'protected content' page unless they were already logged in and their session is still active. This means they need to go to the login page and then back again. This is too many clicks.

Is there a way to embed login information into the url they are emailed that eases this process? Or a different suggestion?

Cheers, Caolan.