Pedro David Marco: > NOW, if one smtp process delivery takes long, long long... until > it dies for the watchdog timeout,
That's 18000s, or 5 hours (setting: daemon_timeout in main.cf). If you still have not fixed the watchdog problem, you should not be asking performance-related questions. Find out what is wrong with your system, whether is is a crippled VPS or some other environment with restrictive resource policies. Wietse