Can't receive mails from outside

Hi!

I can't receive mails from outside. If I send myself a mail from the terminal everything is ok. via Terminal I can also send emails to any E-Mail adress.

In /etc/postfix/main.cf I added my domain to mydestination.

Problem2: I haven't got a log file under /etc/syslog

ad Courier: Imap seems to be working. I can fetch the mails I sent via terminal with Thunderbird.

Thanks for your help!!

the logs are in /var/log dir, not /etc
system log is /var/log/syslog so, you can check whats going on with this file.
tail -f /var/log/syslog

check these logs, while trying to send email from outside.
what is your domain, check your domain "reachability" from outside. what is yourdomain ? I will check.

tail -f /var/log/syslog
says: no such file or directory

my domain is: www.alpdays.at

I've got an ubuntu 10.04 server

Thank you

A Screenshot of the file: /etc/postfix/main.cf
http://www.makroebene.at/main.cf1.jpg
http://www.makroebene.at/main.cf2.jpg