Disable open relay on Postfix

Edit /etc/postfix/main.cf

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sender_restrictions = reject_unknown_sender_domain

Shows a list of files in queue

postqueue -p
postfix reload
postsuper -d ALL

to delete all the items in queue

tail /var/log/mail.log -n 100


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