Hi,

I installed postfix instead of sendmail on my company new mail server, I have aliases for the departments, like sales and management, if I sent and email to these two groups and there is a recipient existed in both groups in the same message he received the message twice, this was not exist in sendmail
as i found while searching about the problem that postfix send email to destination in parallel and did not check if there is a duplicated emails

how can I solve this in postfix, because my management did not need this duplicated emails and I don't want to go back to sendmail

Thanks