[CentOS] sendmail security

[Feizhou]

abhishek singh wrote:
> hi 
> all 
> i am using sendmail mail server, i have configured
> SASL+TLS+MailScanner+Spamassasin+.Procmail and its
> working fine, but there is one problem when i am doing
> telnet to my server on 25 port and using "mail from "
> command to send mail by any user like abc at gmail.com or
> any user @mydomain then sendmail is not able to verify
> sending user , so plz help me how can i verify the
> real sender means i want only my domain real user can
> sendmails .and when i am using mail clients then its
> working fine . prolem is occuring when , when i am
> doing telnet directly to smtp port to my server

Did you use AUTH to authenticate yourself?

Also, from what you say, do you also want to make sure that any user who 
authenticates must use an email address in your domain as their return-path?