Hi, we're running a small relay-service and looking for best practice to deliver mails to remote sites regarding concurrent delivery and so on.
Sometimes, we have customers that are sending several mails per second to same recipients. What is best practice to handle this? We would like to avoid getting blacklisted or throttled by remote sites due to sending too many mails or in an non compliant way. How should this be handled/configured in postfix? so far all settings are default in postfix. thank you.