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Sending emails from macOS

First write in terminal: which sendmail wlll return path to sendmail app (in my case /usr/sbin/sendmail). Then open php.ini file and setup:

Terminal window
sendmail_path = /usr/sbin/sendmail -t -i

Create necessary folder and setup postfix permissions:

Terminal window
sudo mkdir -p /Library/Server/Mail/Data/spool
sudo /usr/sbin/postfix set-permissions
sudo /usr/sbin/postfix start

And check if emails will come:

Terminal window
php -r "mail('', 'subject', 'message', 'From: <>' . PHP_EOL);"