[Dovecot] Error: Maximum number of mail processes exceeded

[Antonio Casado Rodríguez]

Hi, i don't know. Is normal login_max_processes_count > 1024??

Our environment is about 1700 users (imaps + thunderbird or 
imaps+horde). The server is RedHat Enterprise Linux 5.2

User logins different in a hour:
# cat dovecot.info | grep 'Nov 11 10' | grep "login: Login" | cut -d'<' 
-f2 | cut -d'>' -f1 | sort | uniq | wc -l
685

Logins in a hour:
# cat dovecot.info | grep 'Nov 11 10' | grep "login: Login" | wc -l
5749

Is normal??
Should i increment login_max_processes_count?

# dovecot -n
# 1.0.13: /etc/dovecot.conf
log_path: /Correo/log/dovecot/dovecot.log
info_log_path: /Correo/log/dovecot/dovecot.info
protocols: imaps pop3 managesieve
ssl_cert_file: /etc/pki/dovecot/certs/mycert.crt
ssl_key_file: /etc/pki/dovecot/private/mycert.key
login_dir: /var/run/dovecot/login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(pop3): /usr/libexec/dovecot/pop3-login
login_executable(managesieve): /usr/libexec/dovecot/managesieve-login
login_process_per_connection: no
login_max_processes_count: 1024
first_valid_uid: 200
mail_location: maildir:%h/..
mail_executable(default): /usr/local/sbin/post-login-imap-dovecot
mail_executable(imap): /usr/local/sbin/post-login-imap-dovecot
mail_executable(pop3): /usr/local/sbin/post-login-pop3-dovecot
mail_executable(managesieve): /usr/libexec/dovecot/managesieve
mail_plugins(default): quota imap_quota
mail_plugins(imap): quota imap_quota
mail_plugins(pop3): quota
mail_plugins(managesieve):
mail_plugin_dir(default): /usr/lib64/dovecot/imap
mail_plugin_dir(imap): /usr/lib64/dovecot/imap
mail_plugin_dir(pop3): /usr/lib64/dovecot/pop3
mail_plugin_dir(managesieve): /usr/lib64/dovecot/managesieve
imap_client_workarounds(default): outlook-idle delay-newmail
imap_client_workarounds(imap): outlook-idle delay-newmail
imap_client_workarounds(pop3): outlook-idle
imap_client_workarounds(managesieve): outlook-idle
sieve_storage(default):
sieve_storage(imap):
sieve_storage(pop3):
sieve_storage(managesieve): ~/sieve
sieve(default):
sieve(imap):
sieve(pop3):
sieve(managesieve): ~/.dovecot.sieve
namespace:
  type: private
  separator: /
  location: maildir:%h/..
  inbox: yes
auth default:
  passdb:
    driver: pam
  userdb:
    driver: passwd
plugin:
  quota: maildir:storage=1048576