Export mails from mail 4.5?

Hallo together,

I need to export some mails from an iMac who runs OS X 10.6.8 (Snow Leopard).

In that version of Mail I have problems getting my Mails exported.

Because this is the Mac of a work colleague I forgot most of the Snow Leopard "hacks". 😉

In the latest Yosemite version is it very simple to export mails.

But I cannot find any hint from Mail and never seen this problem with snow leopard here in the community.

So either I'm just stupid or that is not possible.

Thanks for your support.