CMS Made Simple Forums

I've got a problem with CMS Mailer.
When I send mail from my website, I get the following error.
SMTP Error: Could not connect to SMTP host. smtp.bahnhof.se:25
I am using Form Builder.

This is what I filled out:
Mailer method: SMTP
SMTP host name: smtp.bahnhof.se
Encryption mechanism: none
Port of SMTP server: 25
Sendmail location: /usr/sbin/sendmail
SMTP timeout: 100

I tested with all sorts of possibilities but may not work.
Grateful for answers

I never use smtp, one of the others work every time for me...