Hi. I setup a server mail with postfix as mtimbro advice me. I explain the situation for those don't know. as i said i setup a server mail for an entreprise. this entreprise count for 50 employees. localy users can send mail for each user they want. but i don't know how they can send out of entreprise. we have an official domain name xxxx.tld. so how to do for sending mail with our official domain name like email@example.com
and not with our domain local. cause our domain local isn't known outside.
i hope you understand the situations. thanks