Just tried it out,
I zoomed in and out in the inbox and inside of an email - both in fullscreen and in non-fulllscren - and....it works beautifully!

I love how it zooms, yet keeps the commands on the far right and left side constantly in view. Very nice.

It doesn't tell you what % of zoom you are at when you zoom - but that's not an issue at all really.
I noticed, I think, that the 'loading wheel' when you open up Macuco is now smaller.

Thanks for the release. I like the approach of relasing an update every time one feature is added - if there only, like in your case, is a list of 5-6 features instead of having us wait for one huge release. Especially with important features like this one.

What's next for Macuco? Hyperlinks opening in new windows?

Thanks again and keep it up.