Dear All，

When the user login P0P3 more than 10 times in 1 minute that the dovecot temporary suspension all of pop3 login about 5 minutes.

How to disable the setting for dovecot.

Mail Log:

Apr 24 16:11:14 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8767, session=<5USPZMX3/QDAqBBU>

Apr 24 16:11:14 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0

Apr 24 16:11:15 mww dovecot: auth-worker: Error: no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

Apr 24 16:11:15 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8769, session=

Apr 24 16:11:15 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0

Apr 24 16:11:16 mww dovecot: auth-worker: Error: no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

Apr 24 16:11:16 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8771, session=<bGSsZMX3AQDAqBBU>

Apr 24 16:11:16 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0

Apr 24 16:11:17 mww dovecot: auth-worker: Error: no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

Apr 24 16:11:17 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8773, session=<ASq6ZMX3AwDAqBBU>

Apr 24 16:11:17 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0

Apr 24 16:11:18 mww dovecot: auth-worker: Error: no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

Apr 24 16:11:18 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8775, session=<Ux3JZMX3BQDAqBBU>

Apr 24 16:11:18 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0

Apr 24 16:11:23 mww dovecot: pop3-login: Disconnected (auth failed, 1 attempts in 4 secs): user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, session=<kP3WZMX3BwDAqBBU>

Apr 24 16:12:04 mww dovecot: pop3-login: Disconnected (auth failed, 1 attempts in 4 secs): user=<jason>, method=PLAIN, rip=192.168.16.59, lip=192.168.16.159, session=<WX9NZ8X3pwDAqBA7>

Dovecot v2.2.9

# 2.2.9: /etc/dovecot/dovecot.conf

doveconf: Warning: NOTE: You can get a new clean config file with:

doveconf -n > dovecot-new.conf

doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:99:

ssl_disable has been renamed to ssl

# OS: Linux 3.13.0-24-generic x86_64 Ubuntu 14.04 LTS disable_plaintext_auth = no mail_location = mbox:~/mail:INBOX=/var/mail/%u namespace inbox {

inbox = 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 =

}

passdb {

driver = pam

}

plugin {

sieve = ~/.dovecot.sieve

sieve_dir = ~/sieve

}

protocols = " imap pop3"

ssl = no

ssl_cert =

ssl_key =

driver = passwd

}

protocol imap {

mail_max_userip_connections = 100

}

protocol pop3 {

mail_max_userip_connections = 100

}

Best regards,

Jason