From: mouss (moussnetoyen.net)
Date: Tue Dec 02 2008 - 07:50:21 CST

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anebiiguanait.com a écrit :
> Hi,
>
> i have some problems with spammers and i would like to ask how to set
> postfix to validate sender email addresses only for our domains. Is
> there some way to do this?

what do you mean exactly by "validate"? check that the address exists?
you can use reject_unlisted_sender.

>
> Other thing that i want to ask. I have this problem:
>
> i connect thru telnet to the smtp server and send email this way:
>
> helo myhostname.example.com
> mail from:realusermydomain.com
> rcpt to:realusermydomain.com
> data
> something here
> .
> quit
>
> mydomain.com is domain from the system.
>
> i'm able to send spam to this user, using the same email address in
> "mail from" field.
>
> Is there some way to protect my mailserver from this kind of things for
> our domains. If "mail from" use our domains (for example
> usernamemydomain.com), then to require authentication.
>

smtpd_sender_login_maps =
        hash:/etc/postfix/sender_login

smtpd_sender_restrictions =
        reject_sender_login_mismatch

http://www.postfix.org/postconf.5.html#smtpd_sender_login_maps

> In any case we use sasl and we require sasl authentication, but i see
> this problem.
>
> How to solve this?
>

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