I need to limit postfix outgoing connections for specific mailservers, but it seems to me that posfix's limiting is based on domains? What if there is one mailserver for more domains? I tried to find out what "destination" means in postfix's tuning manual, but it seems that it is the recipient's domain instead of the mailserver (I may be wrong though)
Current situation: I have a mailserver mail.example.com with IP 184.108.40.206. This mailserver is hosting emails for company1.com and company2.com.
When I set:
smtp_destination_concurrency_limit = 1 default_destination_concurrency_limit = 1
Now, if I send two emails at once - to [email protected] and [email protected], is postfix clever enough to get MX servers for both emails, see that the mail server is identical and limit the connections, or does postfix see 2 different domains and let it go together in two concurrent connections?