On 14/07/17 10:28, Abi Askushi wrote:
> Hi all,
>
> I was wondering what choices are there to block forged sender email
> addresses.
>
> I was thinking SPF could assist.
> The other option I saw is reject_sender_login_mismatch in postfix. *
> *
> Do you have any other suggestion?
>
> Many thanx
> Abi*
> *

Some while ago I created a file to kill inbound spam from non-existent
users such as "accounts" or "help-desk":-

hash:/etc/postfix/valid_users:
ali...@example.com    DUNNO
ali...@example.com    DUNNO
example.com                REJECT Invalid address

and in main.cf:
check_sender_access hash:/etc/postfix/valid_users

The file gets auto-recompiled whenever the alias files change.

Also, when used with check_recipient_access  hash:/etc/postfix/valid_users,
it kills off any log-in identities which I don't want to use as an email
addresses.

hope this helps


Allen C





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