I have made some simple tutorial how to protect your privacy when sending mail remotely.
- Sending mail remotely?
Learn how to protect your privacy.
Also, do you want to conceal that you are using Exim on your SMTP server from the outside world? This is done by changing the smtp_banner variable as follows:
- smtp_banner = $smtp_active_hostname ESMTP Server Ready
Save your configuration file, reload exim. After telnetting to your server, you'll see:
$ telnet yourserver 25
Trying yourserver... Connected to yourserver.yourdomain.tld. Escape character is '^]'. 220 yourserver.yourdomain.tld ESMTP Server Ready
Brilliant! People will not be able to find out easily that Exim is running on your host.