Hi, using header_checks configuration we are dropping all outgoing E-mails except some of them.
# discard all mails not going to cortalconsors.(de|fr) if /^to:/ !/^to:<?.*@(extern\.)?(domain)\.(com)>?$/ DISCARD discarded endif Following rules dropping all outgoing e-mails with recipeint domains different than extern.domain.com domain.com When You sending an E-mail to: To:<zalezny.niezale...@gmail.com> Postfix dropping that E-mail. But when You will send an e-mail to two recipients To:<u...@extern.domain.com>,<zalezny.niezale...@gmail.com> system will deliver both. Why system not dropping E-mail addressed to <zalezny.niezale...@gmail.com> ? Its clear described in the rule, drop all except... I will appreciate for any help. With kind regards zalezny