I've installed a Debian GNU/Linux server with postfix+courier-ldap+amavis+clamav. The server receive 8000 good mail and 150000 spam mail per day. I have a problem with smtp session. There are normaly 30 smtp active session and sometimes the client can't send email. 'SMTP error...' Server Dell with 2 Intel(R) Xeon(R) CPU E5310 @ 1.60GHz and 2GB RAM I insert in Postfix main.cf smtpd_timeout = 30s smtpd_recipient_limit = 200 Thanks in advance -- Roby