Hi, first post so be nice
I've installed RH9 with no problems and set it up as my network's SMTP server using Sendmail. Everything's working, I can send mail from my Windows machines. However, I'm worried that I'm open to spammers using my server as I have the following line in sendmail.mc:
which, if I understand, allows anyone to send mail via my server. Now, I've been told to stop this I should drop all requests on port 25 except from my local LAN. Can anyone advise on how I do this.
I've found RH easy to set up, but IPTABLES seems to be confusing me
Any help would be much appreciated.