Well, I feel silly. There are three places MAILTO can affect crond: /etc/crontab, /etc/crond.d/0hourly, and /etc/anacrontab. Once I set this in these 3 files, I started getting mail from crond. Thank you all for your help.
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From: CentOS centos-bounces@centos.org on behalf of Richard lists-centos@listmail.innovate.net Reply-To: CentOS mailing list centos@centos.org Date: Thursday, July 20, 2017 at 6:54 AM To: CentOS mailing list centos@centos.org Subject: Re: [CentOS] Cron sending to root after changing MAILTO
Date: Thursday, July 20, 2017 02:25:52 +0000
From: Richard lists-centos@listmail.innovate.net
Date: Wednesday, July 19, 2017 23:31:10 +0000
From: Chad Cordero ccordero@csusb.edu
It’s being rejected before it even reaches the mailbox, so
forwarding won’t work. Crond should really be using the MAILTO
variable and it’s not.
In my testing, this worked as advertised. Changing the "MAILTO=" in
/etc/crontab from the default "root" to either a local username or a
remote address resulted in the crontab messages being delivered to
the desired mailboxes. I think I'd put a test command into the
crontab and watch the logs to see what might be going on --
including making certain that the crontab is reloading correctly
after changing the "mailto" value.
Separately, but related, did you run newaliases or postalias after
you added the entry to "root:" in /etc/aliases?
Re-reading earlier messages, are the commands in question being
invoked out of /etc/crontab, /etc/cron.daily, etc. or user-level
crontabs?
The "mailto" value is crontab file specific, so setting it in
/etc/crontab would only effect commands run from there (a file that
isn't used much any longer). As the /etc/cron.daily, etc. jobs are
now run from /etc/anacrontab you'd need to adjust the "mailto" in
that file for things run that way. If run from a user-level crontab
the "mailto" needs to be in that user's crontab file. [cron.hourly is
run out of /etc/cron.d/0hourly, not anacrontab, and has its own
"mailto".]
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