Let you want to validate an email address using php, address is abc@yahoo.com, if you use regular expression, it will pass validation properly but we know – this is not a real email address. So we need to check if an email address is exists or not – it can be done. I’ve created a php class that verify email address. Let me show you how to use this class –
Someone asked me if it’s possible to verify an email address if exists or not without sending any message, so far i know – its not possible to verify without sending any message. Let me explain the steps little how did i do that -
1. Check the pattern, this is public method, so you can use this method only if you want 
2. Verify DNS
3. Verify/Get list of MX entries
4. Create socket with MX server.
5. Send messages and receive response code and analyse. If response returns with code “250″ for “RCPT TO:” message, that means mailbox exists.
Get the sourcecode with example here -
http://github.com/appskitchen/emailverifier
or
Git command line –
git clone git://github.com/appskitchen/emailverifier.git emailverifier
Hope this will help some people.
Hello kodegeek,
Very effective class. it actually worked. The problem was it took 16 seconds to verify from gmail and yahoo took 11 seconds
Yap Dhaval, it tooks time as each step is expensive. Can make it faster by caching DNS, MX data though.
Hey thanks for sharing! Very useful tip
yep…It really works…Sometimes I need to do such work for my duty in office….Thank you Sir…It really good…
You most welcome Syed Golam Rajib
how to add this php class to wordpress ?
sorry i’m newbie.
Hi Darto KLoning,
First decide in which area you want to use this class? See the example file there.
Thanks
Hi Sir,
Your class is accurate and works well.
This is very useful to my project. thanks.
Hi,
I have tested ur code,but its not working for yahoo email addresses,it always says valid against yahoo address even if that address is invalid,also its not working for other domains like shaam@mydomain.com address.
Plz help me to sort out this for yahoo addresses and for other domain addresses.
Thanks
shaam
Hi Shaam, its not guaranteed for accurate result. Sometimes it may fails for a valid email address sometimes it may show an email address is valid although it doesnt exists. All these depends on recipient mail server and your host. If email server doesn’t allow for socket connection or if your host ip is blacklisted – it may fails although email address is valid. If mail server reply you that email address exists although it doesnt exist consequences wrong results, same thing happens for yahoo mail server. So it depends on many things.
Also, get updated class file.
Hi,
Thanks,yes you are right i have same problem,is there any other method of doing this without using SMTP ?
Thanks
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I’m getting this error while checking yahoo…
,, now, what to do???
Received response » 220 mta1352.mail.ne1.yahoo.com ESMTP YSmtpProxy service ready
553 Mail from “myIP” not allowed – 5.7.1 [BL23] Connections not accepted from IP addresses on Spamhaus XBL; see http://postmaster.yahoo.com/errors/550-bl23.html [550]