When something on my Linux servers needs to send email (WordPress, Nagios, cron scripts, etc), I use mailx. With the spam filters everyone has a lot of my automated emails haven’t been reaching their destination. I’ve done the SPF rules and making sure my forward matches my reverse DNS lookups; even have done DKIM. Can’t seem to find a reliable option with sending email from the command line without it getting flagged for spam. The fix was for me to use mailx with a gmail Account profile. This way any email sent from the system will get sent through the gmail servers. Since I host my email domain with GSuite, this was an easy win. I

It broke my mail agent, since I need to redirect to an external smtp server, and nothing else seems to do that properly.