I've recently found out that, if Evernote's user does not verify his email address, all requests to Evernote API is not working. But I didn't find any ways to request email verification in Evernote's web interface, looks like the proposal to verify email appears randomly ? Are there any ways to request email verification from the user ?
You can ask users to change their email address via the page on the web, which will send them a verification email and verify their address.
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I have built an app that uses email & password authentication from Firebase, to enable users to log in, as per the Firebase documentation. The app itself uses Flutter as the coding language. I also have email verification enabled, to prevent spam accounts.
When a user adds their email address and password and clicks 'submit', they're given a notification telling them to check their emails for the verification link, which they must do before being allowed to log in.
The problem I am having is that users do not receive the verification email, so cannot log in. I've come across similar questions on this forum, where the answers have centred around checking spam/junk folders. I have asked the users to do this but they still have not received the email.
I've also tried using my own SMTP server, which is one from which I know I can send emails. Even with this, the users do not receive their verification email. This makes me think the emails aren't being generated/sent, as opposed to them being sent and not being received.
Can anyone suggest why this might be the case? Why is it that users are not receiving the verification email and what can I do to correct this?
If you don't use custom domain, sometimes emails go in spam folder
By default firebase's sending a link to verify the user email, but I want to send a otp with that email. So is there a way to customize that email or send a otp and then once the user entered the correct code on the app get Firebase to mark that user account to email verified?
What you're describing is quite literally what the default Firebase flow does: it send an email with a link that includes a OTP to verify the email address.
You can do a certain amount of customization of the email action handler page that the emails link to. If that is not enough, you will have to implement your own flow, and can then use the Admin SDK in a secure environment to mark the user's email as verified.
I want to send email verification code (not link) to user's create an account on my website with email.
Using firebase authentication, the method is send Email Verification.
Problem is firebase sends a verification link to user's email. Is it possible to send verification code of 6 number to user's email if yes then how it can be done?
Thanks.
I am working on a .NET application and I have set up an external login with facebook.
Currently, when the user uses the external login functionality, signs in to Facebook and my app recieves his email address, I create a new user account and consider the email address verified. (otherwise he could not login)
Is this a good practice though? Is it possible that some attacker would change the email address midway or something? What is the best practice for letting users sign in using external login providers?
Any help would be much appriciated, thanks.
Edit: In this tutorial the guy sends a confirmation email to the email address he recieves from the external login providers. However this seems impractical to me. It kind of defeats the purpuse of simplifying the log in/sign in process, moreover I don't think I was ever asked to confirm my email when I had used external login providers to log in myself.
Is it possible that some attacker would change the email address midway or something?
No, because you are using facebook which implements openid or oauth2.
In oauth2, mail and its password are safe because you do not manage them. Those are managed by your oauth2 provider (facebook in your case)
Also according to the oauth2 flow which is the same in google, facebook, linkedin, etc the provider don't send you the email. It sends you the authorization code:
use go to your web.com
user is redirected to https://www.facebook.com/v8.0/dialog/oauth?client_id={app_id}&redirect_uri={redirect_uri}
oauth2 provider prompts a login if user was not logged in previously
user accepts the consent form (next next)
oauth2 provider (facebook in your case) at the end, perform a final redirect to your web.com (using the callback url previously registered) sending the authorization code: https://web.com?code=196da272-083c
this code is required to generate the access_token and can be used just one time(another http invocation)
the access_token is required to get the email (another http invocation)
The only way to attack could be try to send fake authorization codes to https://web.com?code=**** but in the next step (exchange auth code for a new access_token), facebook will return you an error because the attacker cannot create real authorization codes.
Confirmation email
As you said, if your web allows the user to login with some social network, add a new step with email confirmation is impractical. Is more, facebook allows the use of phone number instead of mail.
But there are some scenarios (not in the authentication) in which mail could be your ally:
Offer an option for alert the user with something like this: Hi Bob, a new account was created with your social network... If you didn't, please click on the following...
confirm an email to be used in future notifications
I am getting ErrorNonExistentMailbox error when sending a draft email from user's account. Its happening to a single user.
{"error":{"code":"ErrorNonExistentMailbox","message":"The SMTP address has no mailbox associated with it."}}
What can be the reason behind this?