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How can I test an email address to see if it is valid? For example, Facebook allows you to create an account with an incorrect email address after verifying with a phone number. Is it possible to check for a valid email address and if so how?
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How can I test an email address to see if it is valid? For example, Facebook allows you to create an account with an incorrect email address after verifying with a phone number. Is it possible to check for a valid email address and if so how?
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If the operating System is Windows you can verify by doing the following
To do it Follow these steps
1.Open Command Prompt
2.Find the exchanger of the domain By nslookup
nslookup – q=mx gmail.com
3.Connect to mail Server using telnet
telnet gmail.com 25
4.once you get the response
type some message hi ,hello
mail from: <youremail@gmail.com>
rcpt to: <test12345666@gmail.com>
5.If you get response code 550
then the recipient address is invalid
6.If email is vaild the mail server would respond back with code 250
Alternatively you could test using some online email checking tools like mailtester .
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There are 3 ways that I have seen sites validate email addresses.
#whois domain.com;
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If you read the RFC http://tools.ietf.org/html/rfc3696 you can end up wtih regular expressions like this ones http://www.regular-expressions.info/email.html
finally test your regexp at: www.regexpal.com
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Easy way I found is online email validity checking tools like vefify email and email checker
I'm inclined to like the first tool, but I tried an email address on my domain that I know exists and another one that I know doesn't, and they both say "UNKNOWN". So it looks like it doesn't work. – InterLinked – 2018-07-10T21:08:55.087
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Those are all technically valid e-mail addresses. See: https://tools.ietf.org/html/rfc3696. Facebook will send you a confirmation e-mail though, so if you enter a non-existing address you cannot use its services: https://www.facebook.com/help/376335499080938 – questions about web applications are off topic though.
– slhck – 2013-09-18T05:48:00.690Precisely define what you mean by "valid" and then see if the email address meets that definition. – David Schwartz – 2013-09-18T06:45:59.093