Towards Open Source

今天客户突然来电告知周一发送给我们的邮件均无回复，而且也无人响应邮件中的事件。我在检查我自己邮件的时候没有发现有任何来自邮箱管理组的邮件，难道服务器出问题了？我通过telnet 25/110可以登录、Web也可以登录，一般均会认为服务器一切正常。不过这次却是一个例外，记录一下也给自己提个醒。
测试邮件发送与接收：

发件人
收件人
描述

test@domain.com
abc@139.com
可以正常发送，但无法正常接收

abc@139.com
test@domain.com
可以正常发送，但无法正常接收

test@domain.com
test@domain.com
可以正常发送，但无法正常接收

由此可见问题可能存在于系统处理邮件的过程中，Zimbra体制当中有两个关键的步骤就是邮件杀毒与垃圾邮件过滤。仔细研究邮件日志，发现以下情况：
Jan 20 11:02:04 ftp amavis[5918]: (02200-05) (!)run_command_consumer: child process [5918]: run_command_consumer: failed to exec /opt/zimbra/dspam/bin/dspam --stdout --classify --deliver=innocent,spam --mode=tum --tokenizer=chained,noise --user zimbra: Permission denied at /opt/zimbra/amavisd/sbin/amavisd line 3154.
Jan 20 11:02:04 ftp amavis[2200]: (02200-05) (!)checking with spam scanner DSPAM failed: DSPAM: error running program /opt/zimbra/dspam/bin/dspam: exit 6
Jan 20 11:02:04 ftp amavis[2200]: (02200-05) (!!)TROUBLE in check_mail: [...]

/opt/zimbra/sleepycat/bin/db_stat -c -h /opt/zimbra/openldap-data
256 Last allocated locker ID.
2147M Current maximum unused locker ID.
9 Number of lock modes.
3000 Maximum number of locks possible.
1500 Maximum number of lockers possible.
1500 Maximum number of lock objects possible.
11 Number of current locks.
81 Maximum number of locks at any one time.
37 Number of current lockers.
76 Maximum number of lockers at any one time.
11 Number of current lock objects.
53 Maximum number of lock objects [...]