Hi, We have postfix-3.1.4 set up on fedora25 to use submission for outbound mail. How can I control the number of recipients that can be addressed in any one email?
Below is my submission config from master.cf. Perhaps it would just be setting smtpd_recipient_limit specifically for submission? submission inet n - n - - smtpd -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes -o smtpd_client_restrictions=permit_sasl_authenticated,reject -o milter_macro_daemon_name=ORIGINATING -o receive_override_options=$submission_overrides -o syslog_name=postfix/submission On a related question, how can we limit the number of recipients addressed in any one inbound email? What does the sender receive when that limit is reached? Will this cause problems with legitimate mail? The problem we're trying to solve is primarily disgruntled employees retaliating via email and sending business-related information to all employees. Obviously this is not a perfect solution, but one we hope will deter the most egregious offenders. We also can't really restrict it via our spam measures because the body contents are directly business related. Of course we'd also like any of the anti-spam abuse protections from this as well. Thanks, Alex
