edwardspl@xxxxxxxxxx wrote: > Dear All, > > There is a smtp server ( sendmail-8.13.8-2 ) with FC6 System : > > For the problem, > 1, how to require user's password and allow his / her domain_name ( > abc@xxxxxxxx and 123@xxxxxxx ) sending mails via smtp server ? > 2, Prevent the IP address of smtp server from listing ( eg : > http://cbl.abuseat.org ) ? > > Edward. > Hi Edward, You may find the following link helpful: http://www.joreybump.com/code/howto/smtpauth.html I know it's not specifically written for FC6, but it will work anyway. Once set up properly, you should be able to allow access to your SMTP server to anyone with a valid login. Tom