CentOS 7.x Zimbra command line for sending logwatch email

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To configure logwatch to use sendmail binary that is part of Zimbra installation use following configuration in /etc/logwatch/conf/logwatch.conf file:

   MailTo = root_all@your.domain
   MailFrom = Logwatch@your.domain
   mailer = "/opt/zimbra/common/sbin/sendmail -t"

Here, only the binary (command) name is sendmail. Zimbra internally uses postfix MTA for sending emails and same would be used by logwatch.

Note that setting Output = mail is not required as that is taken care of by /etc/cron.daily/0logwatch script using "--output mail" option

Further, we can use:

   /opt/zimbra/common/sbin/postqueue -p

command to look at queue and

   /opt/zimbra/common/sbin/postqueue -f 

to flush zimbra queue, while using Zimbra postfix for sending logwatch emails.

Refer:

• https://stackoverflow.com/questions/32820860/how-to-send-mail-from-zimbra-command-line

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