If you are living in Denmark and would like to know which SMTP server to use (and can´t seem to find this on your ISP’s web-site), then try www.iptools.dk and click “SMTP servers” – from your IP these guys seem to be able to determine most popular ISP’s smtp servers.

Besides the SMTP feature there are a bunch of other cool tools on the site, so give it a spin if you are from these parts of the world.