How To Understand Email is Valid And Exist

Question

1.00/5 (1 vote)

See more:

Hi All
I am Developer site.
In Sign Up Section I Want Evaluate Email Or Gmail User Entered Is Valid and Exist.
SomeBody Have Sample For authenticate Web Service?(For Asp.Net)
Thanks So Much

Posted 29-May-13 2:09am

Seyed Ahmad Mirzaee

Add a Solution

Comments

[no name] 29-May-13 8:13am

You can use a regular expression to validate the email address but to know if it exists, you have to actually send an email to that address.

Maciej Los 29-May-13 8:17am

...or check if exists in OP database ;)

Seyed Ahmad Mirzaee 29-May-13 8:16am

Thanks
For Example in This Site:SignUp From Google Or FaceBook And...
When User Click it then Redirect to www.account.google.com and ...
i Need This WebService
Thanks

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Abhinav S · Answer 1 · 2013-05-29T02:27:00

Solution 1

How to Find or Validate an Email Address[^] can help you detect if your email id is valid on the client.

However, its just not possible to detect whether it is an active email id.

Posted 29-May-13 2:27am

Abhinav S

Updated 29-May-13 2:28am

v2

Member77 · Answer 2 · 2013-05-29T02:28:00

Solution 2

You can use Regex method with regular expression "\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" to validate email format.
And for its existence you have to check it from database.

Posted 29-May-13 2:28am

Member77

Updated 29-May-13 2:29am

v3