This code can be on the server and called on AJAX when user tabs out of the email field. Telnet . 25Ĭonnected to .ĥ50 5.1.1 : Recipient address rejected: User unknown in virtual alias tableĢ21 2.0.0 Bye Screenshots – MAC Terminal & Windowsġ) the 550 response indicates that the email address is not valid and you have caught a valid but wrong email address. You can connect to one of the exchanger addresses in the response from Step 1. Step 2 – Now we know the mail server address so let us connect to it. Step 1 – Find mail exchanger or mail server of Please refer to MAC & PC screenshots towards the end of this post. The commands you type in are in green and the server response is in blue. To check if user entered email really exists go through the following in command prompt on windows / terminal on mac.
How to test if the email address actually exists So is there a QUICK solution to really check the email without sending a test message to the user? Yes. This is to avoid users entering wrongly formatted email address but still they can accidentally give us a wrong email address.Įxample of a correctly formatted email address but still Ībove case specifically happens when you take important customer email on phone and you type in the wrong email. We have all been doing email address validation for a very long time to make sure that the email is correctly formatted.
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