node.js - How should I verify email address existence and domain name existence in javascript or nodeJs?

Question

I have tried so many npm packages to verify the email address and domain name. Here are the some of the npm packages I have tried

email-check,
email-verify,
email-existence, 
legit,
email-validator and,
email validation 

all these results in domain name existence and some other checks only. But I have to verify the particular email address exist in the domain. How should I achieve this... Can anyone pls help me to find it out Thanks in advance!!

Answer 1

Today (and probably never) it is not possible to programmatically verify an email address.

The server its at won't for both security and privacy reasons allow that.

And for a good reason. With such solution, spammers etc. could traverse all the servers and get every email address available.

As a note, there are tools out there that claims being email verification solutons. They generally use DNS validations, including MX record(s) lookup, but they can't with 100% accuracy say if an email address exist or not, they can only get what the email server is setup to give them.

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Domain name can be though, and NSLookup is one of the services that can do that.

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Updated

I found a few good reads at SO (where the first is actually a dupe, though can't close it myself)

• How to check if an email address exists without sending an email?

• How to validate an email address using a regular expression?

• How to validate an email address in JavaScript?