to use a public wifi, like coffee shop wifi, in the past you would just press I agree and it would let you in. but now a lot of places have started asking for your email address. what I don't understand is how they know the email address doesn't exist. it's not just about having the right format. if I enter [email protected] it won't accept it. how do they know the email address doesn't exist?
how do they know email address does not exist?
- Thread starter orenew
- Start date
SocialManager
Elite Member
- Nov 26, 2018
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- 3,678
If they try to send an email and it bounces, then they would know. They cannot know by just entering the email address without attempting to send an email. If it just needs a valid email, you could enter [email protected] for example and it will be a valid address.
AllOutAnime
Power Member
- Oct 15, 2007
- 589
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there are services like zerobounce
I dont think they try to send an email because they know it doesn't exist very quickly. as soon as I press submit it says please enter a valid email address
ok then the question is how does zerobounce know?
no, that's not it
Techpreneur
Senior Member
- Sep 2, 2022
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I see only arbitrary answers. It's actually easier than you think.
Just with a 10 lines of Python script, it can be done.
We will only need to check the DNS related information to validate an email address. It could be completed in a fraction of second.
Just with a 10 lines of Python script, it can be done.
We will only need to check the DNS related information to validate an email address. It could be completed in a fraction of second.
nohupt
Power Member
- Jul 19, 2018
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yea but isn't DNS only available for a domain, not an email address? obviously gmail has valid MX records
I don't know much about this stuff but I think you are onto something. this is the kind of answer I was looking for.
Techpreneur
Senior Member
- Sep 2, 2022
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Yes, the script will check MX records and also tries to send an email if we prompt it. Everything could be done on-the-go as I said earlier.
Thanks.
so that I understand what the script does, how would I check the mx records by hand to see if an email address exists?
AllOutAnime
Power Member
- Oct 15, 2007
- 589
- 502
theory is simple
they try to send an email with partial information
if the email is invalid, the mail server will tell it.
using this is hard. many people abused it to validate emails so the big providers like gmail will just ghost you and return fake data. you need a large amount of ips and warmed up servers to achieve it in scale.
they try to send an email with partial information
if the email is invalid, the mail server will tell it.
using this is hard. many people abused it to validate emails so the big providers like gmail will just ghost you and return fake data. you need a large amount of ips and warmed up servers to achieve it in scale.
this doesn't make sense because if you enter a valid email that you have access to, and it lets you in, and you check your email, you didn't get any messages from the coffee shop. so what happened to the email that they supposedly sent?