Jan Müller writes:
I also have this "problem". Sending mail takes about 10 seconds. Weird thing is, that it takes 9 of those 10 seconds before anything appears in the log, then it works quickly.
This must be a stalled DNS lookup.
Recieving mail from outside host is quite fast, no problems there. I have no spam filtering, only blacklist, but quering is not working on internal conections, which is OK.
No, it's not OK. That's precisely the problem. Courier tries to resolve your internal IP's reverse DNS, and probably ends up waiting until your local DNS server gives up on getting an answer from IANA's DNS servers, for IANA's reserved IP address space.
Define reverse DNS records in your DNS server for your internal IPs, and that should fix it.
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