How To check Email ID Exists Or Not

Question

0.00/5 (No votes)

See more:

How To check Email ID Exists Or Not

Now I am Checking Any Email Id Exist Or Not

My Main Problem Is That I have No Smtp server name like ("gmail-smtp-in.l.google.com")
Because i Have Multiple Domain Account

If Any Way To Get Smtp Server Name From Email ID
Or Other Way To Check Email ID Account Exits OR Not

Here My Code It Only Check Gmail Account But I Have Many different Email Accounts

C#

TcpClient tClient = new TcpClient("gmail-smtp-in.l.google.com", 25);
string CRLF = "\r\n";
byte[] dataBuffer;
string ResponseString;

NetworkStream netStream = tClient.GetStream();
StreamReader reader = new StreamReader(netStream);
ResponseString = reader.ReadLine();

/* Perform HELO to SMTP Server and get Response */
dataBuffer = BytesFromString("HELO AnkurHere" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();

dataBuffer = BytesFromString("MAIL FROM:<abc@gmail.com>" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();

/* Read Response of the RCPT TO Message to know from google if it exist or not */
dataBuffer = BytesFromString("RCPT TO:<" + TextBox1.Text.Trim() + ">" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);

ResponseString = reader.ReadLine();
if (GetResponseCode(ResponseString) == 550)
   {
       label1.Text = "Mai Address Does not Exist !";
       label2.Text = "Original Error from Smtp Server" + ResponseString;
   }

/* QUITE CONNECTION */
dataBuffer = BytesFromString("QUITE" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
tClient.Close();

Posted 16-Sep-12 19:13pm

ankur480

Updated 16-Sep-12 19:15pm

D-Kishore

v2

Add a Solution

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)

Bernhard Hiller · Answer 1 · 2012-09-16T22:37:00

Solution 2

Though you cannot check that a specific account exists on a domain, you could at least check that the specified server exists: use e.g. the System.Net.NetworkInformation.Ping class, see http://msdn.microsoft.com/en-us/library/system.net.networkinformation.ping%28v=vs.100%29.aspx[^]

Posted 16-Sep-12 22:37pm

Bernhard Hiller

Sergey Alexandrovich Kryukov · Answer 2 · 2012-09-16T19:28:00

There is no a way to check it it exists or not. If the domain indicated in the domain part exists and the mail delivery agent actually operates on it, it will get your message anyway. What happens next? It depends. Some agents may send your message back and indicate that the addressee is not found, but others will ignore this communication altogether. Even if the "failed to deliver" notification is sent, you usually receive it pretty quickly, but not immediately, so it hardly can be used as you wanted.

For example, a mail system on my site could put all messages with incorrect user names in a special container so I could look it through later, or I could send an auto reply to such messages. As you can see, it is all optional; and different organization use different options, no response being probably most typical.

—SA