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Dovecot 2.3 IMAP high-performance mode

dovecot: master: Warning: service(imap-login): process_limit (400) reached,
    client connections are being dropped

Default configuration

High performance configuration

service imap-login {
    # 16 processi × 500 client = 8000
    service_count = 0
    process_min_avail = 8
    process_limit = 16
    client_limit = 500
}