WordPress Contact Form and Cache Expert

I need an expert to fix a contact form issue on my website caused by Cloudflare and a caching plugin. I’m currently using Hostinger for hosting and Google Workspace for email, and I want the most reliable solution possible. The problem started after I added a caching app to improve website speed, and I’m looking for a long-term fix that doesn’t require constantly clearing the cache. Please configure SMTP properly and ensure the contact form works reliably without ongoing maintenance.