SERVER_NAME is not defined when running wp-cron from real cron/shell

[szepe.viktor]

Automatic updater sends an email but SERVER_NAME is not defined when wp-cron starts as a real Linux cron job.

Please uset get_option('site_url') to determine the hostname.

[dd32]

This is caused by wp_mail() using a fallback address when a $from email is not specified.

I ran into this recently with another CLI WP script, but never looked into it.

[szepe.viktor]

PHP Notice:  Undefined index: SERVER_NAME in /var/www/noemi-salatabar/server/wp-includes/pluggable.php on line 328

[SergeyBiryukov]

Duplicate of #25239.