I have a qmail-ldap installation with 15k+ users on the system, the specs as follows:
quad Xeon 550 MHz with 1 MB cache 1 GB RAM /var is mounted on a Mylex DAC1164P with 4 Ultra SCSI 3 HDD in RAID 5 OpenLDAP on another Dual processor 933 MHz server. System is running RedHat 7.1 with latest kernel from RedHat
The problem is that once we get a dictionary attack on the server the 'not yet preprocessed' gets bigger and bigger while checking on qmail-send the deliveries are so little
the local deliveries are set to 500 and the incoming (smtpd) is set to 300, where is the problem.
