https://sneakemail.com https://sneakemail.com does what you want and has been around for over 15 years. It also supports greylisting, generation of temporary em

https://sneakemail.com https://sneakemail.com does what you want and has been around for over 15 years. It also supports greylisting, generation of temporary email addresses based on keywords, disabling and re-enabling of temporary addresses, multiple rulesets, tweakable everything. Freemium model.