Assuming the e-mail passes validation, you can then pass it through another validator that could look for a known top-level domain, check the domain for an MX record, check for spelling errors from common domain names (gmail.cmo), etc.Then present a warning giving the user a chance to say "yes, my mail server really does allow 🌮🍳🎁 as an email address." As for using exception handling for business logic, I agree that is a thing to be avoided.These are all perfectly valid forms: For most use cases, a false "invalid" is much worse for your users and future proofing than a false "valid".Here's an article that used to be the accepted answer to this question (that answer has since been deleted).Our "validate email address" tool is 100% free, superbly fast and very accurate and reliable. Using General Tips Using a Google Transparency Report Using the Better Business Bureau Community Q&A This wiki How teaches you how to evaluate an internet site's credibility before using it.Rather, you know the address exists, but you don't know whether a human sees it or whether it just goes to a program that generates a bounce message. A site can't "turn off" the ability to accept mail for valid mail addresses, by definition of the term "valid mail address." :-) -- Darren New San Diego, CA, USA (PST). And the site to which I did this 'accepted' the request, and then emailed me back a msg saying no such address, even while the direct telnet to the port appeared to accept the email address as legit. You failed to determine that the email address does not exist. Those who work hard with few results always value hard work over getting results. -- -- I'm curious; where does this statistic come from?
Providing sanity checks is still a good idea for user experience.
One of the most important reasons why consumers want to verify, validate and check an email address is to determine of email where you would like to send your message is "dead" or not.
By validating and verifying emails you can clean list from "dead" mail addresses and prevent undeliverable e-mail messages error into your mail box.
For that reason we have lanched free email verifier also known as email lookup or email validation, powerful email checking tool which is able to test, validate, check and verify emails from your mailing lists.
Validating email addresses with our free Email verifier / Email lookup is an important step for several reasons.