We have a Vserver from server4you.de with min 512MB / max 1GB RAM. It took me a few nights to find out why smtp-auth width Plesk 8.01 installed doesn`t work. It seems, that the auth-process gets kicked because of a memory limit. I checked with telnet and used a CRAM-MD5 maker to send the right password string and i get a "421 out of memory". What the hell? ---clip-------------------- 220 xxxxx.de ESMTP EHLO client 250-xxxxx.de 250-AUTH=LOGIN CRAM-MD5 PLAIN 250-AUTH LOGIN CRAM-MD5 PLAIN 250-STARTTLS 250-PIPELINING 250 8BITMIME AUTH CRAM-MD5 334 PDI0NTE4LjExNTY4NDE2M333ZXNvbm8tNS5kZT4= c3ZlbkBwaXhlbGp1bmtpZS5kZSA3OGU2MGQ3NDQxNmMyNzZjY2FhNDNmZTdiYjllZjk4NQ== 421 out of memory (#4.3.0) 535 auth failure ---clap-------------------- I checked the available RAM with a vmemusage script provided by the hoster and it shows 312MB used of 512 available. So that should not be the problem. I found this about increasing the "softlimit": http://www.gossamer-threads.com/lists/qmail/users/130727 and this: http://www.linux.com/howtos/Qmail-ClamAV-HOWTO/x277.shtml But that didn`t help me, because i can`t find the line or even the right script where i should add/change the softlimit. Any ideas?