Email confirmation link not always showing up

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Backendless Version (3.x / 5.x, Online / Managed / Pro )

Client SDK (REST / Android / Objective-C / Swift / JS )

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I have opted for email confirmation while registration but i am not always getting confirmation links for different registrations.

Hello Manav,
Unfortunately, we cannot guarantee a 100% delivery for multiple reasons, though we’re definitely aiming to. But we have an API which allows you to request resending the confirmation email, so you may give your users the ability to call that API in case they did not receive it.
The method is not in the documentation yet, but you can find it in the list of methods for UserService. For example, here’s the one for Android SDK: https://github.com/Backendless/Android-SDK/blob/master/src/com/backendless/UserService.java#L556