[Plugin: Fast Secure Contact Form] messase "sucessfully sent" but is not coming to my inbo

Hi, I am trying to use this form on this page https://anecdesigns.com/contacto/ I try to fill all fields and send it as a test, it says the message has been successfully sent but I don’t receive anything in my email inbox, why?

I’ve tried to use both Send E-mail function: PHP and WordPress, and have used my corporate email and gmail.

Any suggestions?

Thanks in advance

https://www.ads-software.com/extend/plugins/si-contact-form/