Switching to Cloudflare email routing from Zoho Mail

Switching to Cloudflare email routing from Zoho Mail

Hello,

I'm currently working on migrating from Zoho Mail to Cloudflare's email routing solution. This requires changing MX and TXT records for our custom domain - when we do this, will our users still be able to log into their accounts and access an archived version of their emails? Will these emails be deleted? Thanks.