Hi guys, After checked here and there, I made a "pre" conclusion that the thing that has made emails waited long enough in the Outbox was the scanning performed by simscan (with clamAV and spamAssassin). Since each of our client has their own Kaspersky AV that scans email's traffics, I've decided to get rid the virus/spam scanning for local deliveries, and perform that only for incoming emails (from other domain) instead. Now the delivery is faster than before.
Here the qmail-smtpd.rules I have. 127.:allow,RELAYCLIENT="",SMTPAUTH="",AUTHREQUIRED="" 192.168.:allow,RELAYCLIENT="",SMTPAUTH="",AUTHREQUIRED="" :allow,QMAILQUEUE="/var/qmail/bin/simscan" 192.168. is our local id network. I have to put it into the qmail-smtp.rules because if I did not, then all traffic from our local network will be scanned by simscan either (the 127.~ line itself won't be enough). Well, that's it. Tomorrow I'm going to hold another test with more people. Thank you very much for all your kindness. Bless you all. Best regards, sato
