[Sussex] Securing Mail Servers

[John Crowhurst]

On Sun, April 16, 2006 17:01, paul.morriss at tokenbay.co.uk said:
> We have added security that it will be bounced if the from address is not
> valid but is there a way so that only authorised users can send mail..
>
> Apologies if this has been asked many times but I am new to mail systems.

Look at SMTP-AUTH, so only authorised (via a password or secure
interchange) will be able to send email.

Exim:
http://www.debian-administration.org/articles/280

Sendmail:
http://www.sendmail.org/~ca/email/auth.html

Postfix:
http://postfix.state-of-mind.de/patrick.koetter/smtpauth/

--
John