I have integrated https://debounce.io/ its very reliable and is cheap to workflow an API call to validate the email address.
Typically you get the following response and you can take what action you want based on the “code”
{
“debounce”:{
“email":"testemail@gmail.com”,
“code”:“5”,
“role”:“false”,
“free_email”:“true”,
“result”:“Safe to Send”,
“reason”:“Deliverable”,
“send_transactional”:“1”,
“did_you_mean”:""
},
“success”:“1”,
“balance”:“1725935”
}
The great thing is you can check for types of email addresses too, for instance a personal v role based account, savign you having to guess.
No need for a plug-in just use the Bubble API tool.