No emails send

Hey all,

found the elgg and it seems to be a very good thing.

Now i have some problems. Elgg didnt sent any emails. Do I have an email server?

If I want to reset password, or register any new account I got no email.

If I want to sent emails through the "board" there is no email send.

Is there any solution for this problem?

If you would give me a hand i would very happy about.

Best wishes