We Cant verify that this email came from the sender so it might not be safe ...

Hey

Just wondering how i can stop this message coming up when sending an email via a contact form on a site i have hosted. is it a IP issue or a server setting that i need to change or do i need to add any dns records ?

Thanks in advanced.

Dave

Is it via a php script? Does it use the php mail function or does it properly authenticate via SMTP?

its the plugin fluent forms on wordpress i didnt set any smtp settings so must be via php mail function
Thanks
Dave

Then install some SMTP plugin for Wordpress like "WordPress Mail SMTP" and configure it to send emails using SMTP with authorization.

Yes, the php mail function is not safe to use and is deprecated in AlmaLinux -- so use a proper alternative (SMTP) that authenticates, logs, and has manageable rate limits.