Hi Ashleigh,
Well! It’ll require some technical intervention from folks who manages your website backend and implementing 3rd party systems for email validation and captcha. And, that depends on technical feasibility checks and priorities to be aligned with your tech dept. I’d be happy to get it done with you, if that sounds good to you.
Also, I noticed you do send a confirmation email for double opt in when somebody subscribe to a newsletter but, authentication domains are not aligned and DMARC not implemented in the headers. This is a must to safeguard your email reputation and deliverability.
Happy to hop on a call and talk further, if that’s okay!
Regards,
Mohsin