Hi All,

I have a problem with SASL authentification from postfix when more than 10 mails is sent from the same user simultaneously Postfix abort connection ( Connection lost to authentication server ). Dovecot log after the postfix error an error about
connection lost also ( read EOF )

I don't seem to find a parameter for a maximum of connection for the auth process ( ther's one for imap, pop, .. ) but none for auth.

Do you have an idea of a way to solve this problem or to have better information ?

result of Docecot -n


# 2.2.13: /etc/dovecot/dovecot.conf
# OS: Linux 3.15.6-gentoo-xxxx-std-ipv6-64 x86_64 Gentoo Base System release 2.2
auth_default_realm = aprogsys.com
auth_mechanisms = plain login
auth_username_format = %Ln
dict {
  acl = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
dsync_remote_cmd = ssh -l%{login} %{host} doveadm dsync-server -u%u
first_valid_uid = 1001
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
mail_access_groups = dovecot
mail_location = mdbox:~/mdbox
mail_plugins = " acl notify replication"
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave duplicate
namespace inbox {
  inbox = yes
  list = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
  separator = /
}
passdb {
  args = *
  driver = pam
}
plugin {
  acl = vfile
  acl_anyone = allow
  acl_shared_dict = proxy::acl
  antispam_backend = DSPAM
  antispam_debug_target = syslog
  antispam_dspam_args = --source=error;--signature=%%s;--user;%n
  antispam_dspam_binary = /usr/bin/dspam
  antispam_signature = X-DSPAM-Signature
  antispam_spam = SPAM
  antispam_trash = Trash
  antispam_verbose_debug = 1
  mail_replica = remote:root@192.168.1.7
  replication_dsync_parameters = -d -U
  sieve = ~/.dovecot.sieve
  sieve_before = /var/lib/dovecot/sieve
  sieve_default = /var/lib/dovecot/sieve/spam.sieve
  sieve_dir = ~/sieve
}
protocols = imap pop3 lmtp sieve
replication_max_conns = 2
service aggregator {
  fifo_listener replication-notify-fifo {
    mode = 0666
  }
  unix_listener replication-notify {
    mode = 0666
  }
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    mode = 0777
  }
  user = root
}
service dict {
  unix_listener dict {
    mode = 0666
  }
}
service imap-login {
  process_min_avail = 4
  service_count = 0
  vsz_limit = 256 M
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
  inet_listener sieve_deprecated {
    port = 2000
  }
}
service replicator {
  process_min_avail = 1
  unix_listener replicator-doveadm {
    mode = 0666
  }
}
ssl_cert = </etc/ssl/dovecot/server.pem
ssl_key = </etc/ssl/dovecot/server.pem
userdb {
  driver = passwd
}
protocol lda {
  mail_plugins = " acl notify replication sieve"
}
protocol imap {
imap_client_workarounds = delay-newmail tb-extra-mailbox-sep tb-lsub-flags
  mail_max_userip_connections = 40
  mail_plugins = " acl notify replication antispam imap_acl"
}

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