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hi everyone how are you in this small lecture I want to talk about the email verification process how email validation works in the back and read is very important if you want to understand how this process works and why some emails may seem to be valid and they are not why when you use some email relation applications or services they give you incorrect or inaccurate results and so on or if you are a developer and you want to develop email validation service this lecture will really help you understand the operation and then you can apply to your own application code so stay tuned and follow up with me [Music] okay friends please before we start don't forget subscribe to my channel now to get every new update almost everyday so to make things simple and don't waste time whatever you'll want to validate an email we pass in four phases or four steps step number one is what we call send text validation we check this text this form of text is it an email is a valid send text email you know an email address is constructed from the account name then the @ symbol then we have the domain name so as an example my email address is support at adjudicate calm so the email are validating is a valid email syntax this is the first step of yes very good the next step if not of course will not continue the operation the second step is to verify the existence of that domain so as an example again in my case support at hdk calm adjudicate calm is the domain name does this durian exist in this planet as anyone using this domain if yes very nice so this step 2 is verified the existence of this domain because if this domain is not being used by anyone so of course this email does not exist the third step is to verify if there is a mail server behind this dummy if there is no mail server then of course there is no email addresses so how to check this simply weak worry the DNS records of that domain to check if there is an MX record which is the mail server record in the DNS zone simply we can do this using a command line we can program a small application to this we have online service that do this let's take a look on two methods on how to query the MX records of a certain domain you can see here I am running CMD or command product we can simply and as look-up current then simply right set is equal Q equal M axe which means we need to query the MX records then simply enter the domain name you wanna check in my case I will use H educate calm as an example and as you can see here is the mail exchanger records you can see the Google Mail server because I'm using G suit for this domain so simple other way is to use online services like MX toolbox simply enter the domain name again I max look up and you will see the records here very simple so in this way we can verify the existence of a mail server behind our domain so if there is a mail server very nice we can go to step number four which is the main important step which to verify the existence of a mailbox and this step is the hardest step in this operation the first three steps are so simple and you can get up to 100% accuracy but when we talk about step number four which is the mailbox verification this is the hard part so please concentrate with me well let's firstly explain how this operation stopped for works then I will tell you why it's somehow hard and what the problems in this step simply when we want to verify a mailbox we open an SMTP connection with that mail server and we send a hello call it's simply an SMTP comment a Hello comment we say hello means server how are you if you want and then we send a mail to that mailbox with that email address but then we close the connection and we don't send it really so we are just simulating the sending operation to check if that mailbox exists or not so if the response was okay then the mailbox exists in this way we verify the mailbox existence so why this operation is somehow hard mainly we have three problems the first problem they're poor 25 problem you know when you want to up an SMTP connection you need port 25 to be opened so if you are using a local application like my free email validation service or any email validation application that is installed locally if you don't have port 25 open this application will not do anything you can't validate the mailbox so this problem number one which is the port 25 problem so you need to get a machine which having port 25 enabled and the best choice is to get a VPS a Windows EPS machine that that has port 25 open the second problem is that we have a lot of companies especially like I remember hot Maine and Yahoo have some complexity when you try to connect to their mail servers it's not that easy and they will not allow you always to open a connection traditional connection and connect their mailboxes using the SMTP tunnel so here it comes the second problem that they reject your response before you even simulate the message so in this way you'll will find some obstacles and you'll find it somehow harder to communicate certain mail servers with your application or manually using an SMTP connection the third problem is that some domains or some companies allow something called accept all so any email you try to send a hello comment or select a message to anything any account even if it doesn't exist it will say yes it will accept the response on this way you will never know if this email exists or not we try to fix this simply by creating a long string of unique numbers and and characters and trying to verify if this email exists or no in this way if this exists this means that that server has enabled accept all so you can simply verify this email on that dummy I hope you got this idea by the way I get a lot of questions about my free email validation application a lot of people download it some people contacted me they tell me you have nine percent accuracy and some people told me this application is not working for me and so on please as I told you when you wanna use low can email validator application you need for twenty-five to be opened and the second problem is that some mail server as I told you like yahoo and hotmail we are having some problems communicating with their mail servers but i promise you to release a new version soon with a lot of more features and I will always do more researches and find the perfect solution to give you the full free email validation application I'm trying my best to help you so please if you want to help me go and download the application in finally I can inscription below it's free just download you can test this application you can send me the feedback so I can analyze these results and improve the application and so on please don't comment these silly comments and your application is not working your application is fooling us and so on these silly comments please help me so I can help you send me your feedback so I can improve my application and give you the best accuracy with the email validation application so to sum up we have four steps syntax verification we have dummy verification that males have verification and at last mailbox verification I hope you got some benefit this is the operation of email validation in the back and thank you for following if you need any help you have any question any doubt anything you want I would be with you any time just just check the support links in the description below thank you for following if you liked the video don't forget subscribe to our channel to like the video and to press on the bell for notifications you can also view our other lectures thank you and see other videos