Remove custom email rule from wordpress site – CPanel

Help a developer i hired not only he didn’t finish the job, but also he left a rule that sends him a copy for everyone who sings up on my site i’ve been trying to remove the rule from the plugins to no avail I am new to programming, below ill place some images hopefully one can indicate me where such rule could be, i want to mention i am using fluent form and that also he had ftp access only to that specific directory as i didn’t fully trusted him.

also, there are not custom snippets in the snippets section
also he never had access to cpanel, and the email is sent only from that specific form i belive as it was the only form at the time enter image description here

I can confirm that removing the plugins and removing cache and re-installing the plugins doesn’t work but I can officially confirm that the issue only happens when this line is added into fluent form, methods=stripe&fname={inputs.names.first_name}&lname={inputs.names.last_name}&email={inputs.email}&cname={inputs.input_text_1}&acname={inputs.input_text_2}&phone={inputs.numeric-field}&admin_url={submission.id}
Even if only this: methods=stripe is added, still send the email to him that instructions tells the plugin where to find that email address
i tried typing the email address in php my admin and file manager in cpanel but nothing i find only logs at most of the emails sent