API to verify if mail id is valid or not

Question

API to verify if mail id is valid or not

Dalmia, Shashank 1

Need to check if the email id provided by user is even valid or not.
How it can be done using outlook API which I can integrate in my system

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Answer 1

Vasil Michev 119.5K MVP Volunteer Moderator

You have to be more specific here, what exactly do you mean by "valid"? You can validate whether the string value provided by the users matches the requirements for an email address as per RFC, there are ready-to-use regular expression patterns you can find online.
Validating that the address itself exists and can receive emails is another story, there is no way to do that for any external address, apart from sending a test email. If your scenario is for internal emails only, you can use the Get-ExORecipient cmdlet or the underlying endpoint to verify that a valid recipient exists in the organization.

Dalmia, Shashank 1 Reputation point

2022-09-12T12:36:05.7+00:00

Hi Michev,

Thanks for your quick response.
Yes I wanted to check if a particular email address even exit or not due to some typos it happens that the mail is left undelivered. So by Validating I meant the same.

Thanks,
Shashank
Dalmia, Shashank 1 Reputation point

2022-09-12T12:44:26.22+00:00

I meant there Exist
Vasil Michev 119.5K Reputation points MVP Volunteer Moderator

2022-09-12T13:07:23.523+00:00

As mentioned above, the only way to do that would be to send a test email. Here's what the official documentation suggests: https://learn.microsoft.com/en-us/dotnet/standard/base-types/how-to-verify-that-strings-are-in-valid-email-format
Dalmia, Shashank 1 Reputation point

2022-09-12T14:57:12.89+00:00

Hi
Got your point. But this takes me to another query:

Then how these email verification Applications or Website let us know if the Email even exit or not?
They might be using some configurations because for sure they don't send email and check if it's real or not.
Vasil Michev 119.5K Reputation points MVP Volunteer Moderator

2022-09-12T15:41:01.49+00:00

Pretty sure most of them verify just the pattern. Or leveraging databases with exposed/leaked addresses.

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API to verify if mail id is valid or not

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