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clamav-milter.service链接如下：
https://gitee.com/src-openeuler/clamav/blob/openEuler-23.03/clamav-milter.systemd
`[Unit]
Description = Milter module for the Clam Antivirus scanner
After = syslog.target nss-lookup.target network.target
Before = sendmail.service
Before = postfix.service
After = clamd@scan.service

[Service]
Type = forking
ExecStart = /usr/sbin/clamav-milter -c /etc/mail/clamav-milter.conf
Restart = on-failure

User=clamilt
Group=clamilt

PrivateTmp=yes
PrivateDevices=yes
CapabilityBoundingSet=CAP_KILL

ReadOnlyDirectories=/etc
ReadOnlyDirectories=/usr
ReadOnlyDirectories=/var/lib

[Install]
WantedBy = multi-user.target`

实际执行的命令和issue测试问题一致，systemctl start clamav-milter服务可以启动成功。

kernel升级后，clamav-milter -c /etc/mail/clamav-milter.conf命令无回显，可以用 clamav-milter -c /etc/mail/clamav-milter.conf & ，后获取返回值来判断命令是否执行成功。

已与开发确认，命令后置可以启动服务