Verify Live Email Address exists or not

shaileshgurav

I want to check whether entered email id (eg. xyz@ymail.com, abc@rediffmail.com etc) is already exists or not. I dont want to use any third party payable tool or dll in software. Please help me out.

Debojyoti Saha

Which language you want to code it?

Lost User

Exists where?

Richard Deeming

The only way to verify whether an email address actually exists is to send a message to it. (The SMTP specification includes a verb to verify (VRFY) an address without sending a message, but most servers turn it off for security reasons[^].) Include a random one-time-use link to a page on your site which marks the address as "verified" when the user clicks on it. Implement the Registration Verification Pattern[^] Sending email verification link to activate profile c# | StackOverflow[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

Kornfeld Eliyahu Peter

Richard Deeming wrote:

The only way to verify whether an email address actually exists is to send a message to it.

I would say, the only way to verify whether an email address actually exists is to receive a message from it...And also that is just for the moment...

Skipper: We'll fix it. Alex: Fix it? How you gonna fix this? Skipper: Grit, spit and a whole lotta duct tape.

Lost User

That information is not stored in a single location; they are created on a mailserver, and those do not provide a public list. That is why the send-link-pattern was mentioned; it is the only way to verify whether an address is actually in use.

Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^][](X-Clacks-Overhead: GNU Terry Pratchett)

Richard Deeming

Receiving a message from an email address doesn't necessarily mean the address exists. :)

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

lokerjobindo

Checking email addresses for validity is a tricky process. EmailValidator.Net has made this process incredibly simple and powerful. The only correct way to verify an email address exists is to send a mailbox an email and see if you receive a bounce back email or NDR (Non-Deliverable Receipt). EmailValidator.Net validate email addresses WITHOUT sending an actual email.ss C# code sample : protected void LinkButton1_Click(object sender, System.EventArgs e) { // We create our Mail Validator Object Codicode.Emailvalidator Ev = new Codicode.Emailvalidator(); // Sender email (for smtp identification) Ev.Mail_From = "admin@monoprog.com"; // Sender email (for smtp identification) bool Valid_Email = Ev.Check_Mailbox(Textbox1.Text); } protected void LinkButton2_Click(object sender, System.EventArgs e) { // We create our Mail Validator Object Codicode.Emailvalidator Ev = new Codicode.Emailvalidator(); // Sender email (for smtp identification) string[] Mx_Records = Ev.FindMXRecords(Textbox1.Text); } thanks sign Lowongan Kerja S1

Daniel Miller

I understand your reluctance to use third-party tools, because I encountered a very similar problem (with very similar requirements) working on a project for one of my customers. Email verification is a complex process, and it requires several validation levels: 1. The email address itself must have the correct syntax, so a regular expression check is needed. 2. The email address must reference a valid domain name, so a DNS query is needed. 3. The email address must reference a domain name that accepts mail server connections, so an SMTP connection is needed. 4. The email address must reference a valid inbox on the receiving mail server, so a send (or send attempt) is needed. You don't have to use the components from this particular developer, but you might his descriptions of the above levels sufficiently detailed to implement your own solution using your own code. Refer to the section titled "Understanding Validation Levels" on this page: http://www.afterlogic.com/mailbee-net/docs/getting_started_with_address_validator.html[^] Speaking from my own experience, it is certainly possible to write the code to implement all four validation levels, but it turned out to be too expensive and too time-consuming for my customer, and so I was able to convince them to license software components from that developer.