fmsfzcleechboxnet im running postfix 247 stress patch linux 26 server antispam relay high concurrency receiving mail 95 messages received deleted relaying isnt usually problem current smtpd process limit 2000 hits limit quite regularly queues tmpfs avoid disk io server writes mail hold queue via header_checks filtering mailscannerlike application im aware problems method dont think theyre directly related issues issues ive encountered 1 process limit hit stress function triggers reload problematic system reload causes smtpds exit respawn almost immediately new connections come churn enough make connections timeout 1020 seconds ive fixed easy modification doesnt reload stress mode triggered needs ok 2 tested 4000 smtpd processes limit saw much 2000 smtpd processes messages tend pile incoming without moved active processes drop back trigger reload mail moved active delivered easily 3 troublesome server busy sometimes see cases messages written hold 1020 seconds smtpd processes die suddenly messages start written interesting bits postfixs log cases 2 3 seem indicate system postfix limitation im reaching havent able pin anyone else run high concurrency see similar problems suggestions might happening welcome thu 07 aug 2008 084717 0800 high concurrency smtpd issues