HPUX 11.31 sentmail 报错 cannot create dead.letter reason: I/O error

/var/mail/root

 中报错如下，并且有很多条

The original message was received at timeXXX)

from localhost

with id 341Jdxxxx

   ----- The following addresses had permanent fatal errors -----

root

    (reason: I/O error)

    (expanded from: postmaster)

   ----- Transcript of session follows -----

mail: cannot append to /var/mail/root

mail: cannot create dead.letter

451 4.0.0 I/O error

Message could not be delivered for 5 days

Message will be deleted from queue

--346JxkS4029800.1683406251/hostnameXXX

Content-Type: message/delivery-status

Reporting-MTA: dns; hostnameXXX

Arrival-Date: timeXXX)

Final-Recipient: RFC822; postmaster@hostnameXXX

X-Actual-Recipient: RFC822; root@hostnameXXX

Action: failed

Status: 4.4.7

Diagnostic-Code: X-Unix; 74

Last-Attempt-Date: Sun, 7 May 2023 04:50:51 +0800 (EAT)

此问题可以检查几点：

1.sendmail.cw 中设置的主机名称，是否可以解析

需要检查：

 sendmail.cw

nsswitch.conf

/etc/hosts

2.检查sentmail 目录是否满了

/var/spool/mqueue

/sbin/init.d/sendmail stop

然后把/var/spool/mqueue目录下的所有文件用tar打包成一个文件

并保存打包的tar文件到一个合适的位置

然后清空/var/spool/mqueue目录

启动sendmail进程

/sbin/init.d/sendmail start

此问题按照上面第2项，清空sentmail目录，重启sentmail进程解决。