- Unable to send email via web form that is written on php.
- Nothing can be found in /var/log/maillog
- Outgoing anti-spam is enabled on the server.
Allow using Sendmail for scripts and users on this subscription option is disabled on subscription.
Make sure that Sendmail utility is allowed to use:
Plesk > Tools & Settings > Mail Server Settings
Plesk > Subscriptions > example.com > Change Outgoing Mail Limits