I configured about a dozen domains to have MX records for the mailinator disposable inbox service for about a decade for free as a gift and the domains were toxic for any other email use case for years afterwards… they were so abused you couldn’t even sign up for most web services with any email associated by the time I stopped renewing them… there are still GitHub lists of disposable email addresses that list to blacklist those domains (and many other), so, I agree. If the big providers don’t offer disposable email addresses there is no good option.

Mailinator was an awesome service when it first worked. Thank you!!!