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I am struggling to prevent SPAM generated from my server.

my mail.log reads like this:

<postmaster@mywebsolutions.co.in> from p57bfa587.dip0.t-
ipconnect.de[87.191.165.135]; from=<postmaster@mywebsolutions.c
o.in> to=<2709457912@txt.att.net> proto=ESMTP helo=<p57bfa587.dip0.t-
ipconnect.de>

mywebsolutions.co.in is my domain. but p57bfa587.dip0.t- ipconnect.de is not neither 2709457912@txt.att.net

Now I want to block any unknown sender. but couldn't find anyway to prevent this.

I have also added in my postfix main.cf

smtpd_reject_unlisted_sender = Yes

Also smtpd_sender_restrictions = reject_unlisted_sender

Full Block reads like this: smtpd_sender_restrictions = reject_unlisted_sender, check_sender_access regexp:/etc/postfix/tag_as_originating.re , permit_mynetworks, permit_sasl_authenticated, check_sender_access mysql:/etc/postfix/mysql-virtual_sender.cf, check_sender_access regexp:/etc/postfix/tag_as_foreign.re smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf

What rule I should change or update to prevent SPAM Originating from my server.

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