The conf. file of Dovecot (The m

protocols = imap pop3
#
# Uncomment the ssl_listen statements and comment out listen if using SSL
protocol imap {
listen = *:143
# ssl_listen = *:993
}
protocol pop3 {
listen = *:110
# ssl_listen = *:995
}
syslog_facility = mail
# Uncomment these if using SSL
#ssl_cert_file = /etc/ssl/rnd/mailserver/smtpd.crt
#ssl_key_file = /etc/ssl/rnd/mailserver/smtpd.key
#ssl_ca_file = /etc/ssl/rnd/mailserver/cacert.pem
#ssl_verify_client_cert = yes
#ssl_parameters_regenerate = 168
#verbose_ssl = no
#
# Where the mailboxes are located
mail_location = maildir:/var/vmail/%d/%u
#
first_valid_uid = 150
#
protocol imap {
login_executable = /usr/libexec/dovecot/imap-login
mail_executable = /usr/libexec/dovecot/imap
}
protocol pop3 {
login_executable = /usr/libexec/dovecot/pop3-login
mail_executable = /usr/libexec/dovecot/pop3
}
protocol lda {
postmaster_address = postmaster@sip.rnd.pk
sendmail_path = /usr/lib/sendmail
}
#
#
auth default {
mechanisms = PLAIN
passdb sql {
args = /etc/dovecot-mysql.conf
}
userdb sql {
args = /etc/dovecot-mysql.conf
}
}
disable_plaintext_auth = no
login_process_per_connection = yes
login_processes_count = 2
login_max_processes_count = 128
login_greeting = Welcome to R&D Mail Server.