On 06-11-2020 13:48, Rafael Azevedo wrote:
Hi there,
This is an old issue and I believe it has already focused on older
discussions.
I'm receiving SPAM from my own address.
Checking server logs, user is not authenticating and the only way this
spammer can play a trick is by sending an email to its own address (ie:
from raf...@mydomain.com <mailto:raf...@mydomain.com> to
raf...@mydomain.com <mailto:raf...@mydomain.com>).
Is there a way to avoid this practice ?
Thanks in advance.
BR,
Rafael
Hope I get this right. In main.cf you can put a section:
smtpd_sender_restrictions =
...
check_sender_access hash:/etc/postfix/sender_access
...
And in /etc/postfix/sender_access you then add your domain (see man 5
access for more information):
mydomain.com REJECT You are not mydomain.com
Then run postmap
# postmap /etc/postfix/sender_access
And finally
# postfix reload
Note that this only works for MAIL FROM, see
http://www.postfix.org/postconf.5.html#smtpd_sender_restrictions
http://www.postfix.org/postconf.5.html#check_sender_access
Best,
Patrick
