1、打开Courier-IMAP配置文件(/etc/courier/imapd):
# cd /etc/courier/imapd
2、重新配置MAXDAEMONS和MAXPERIP数值
[...]
##NAME: MAXDAEMONS:0
#
# Maximum number of IMAP servers started
#
MAXDAEMONS=40
##NAME: MAXPERIP:0
#
# Maximum number of connections to accept from the same IP address
MAXPERIP=20
[...]
3、重启Courier-IMAP服务
# /etc/init.d/courier-imap restart
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