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Q: 

ASP.NET SqlMembershipProvider: Unique but not required email?

Is there a way to configure ASP.NET SqlMembershipProvider such that Email is optional but when provided must be unique?

I only found the requiredUniqueEmail attribute (web.config) which makes Email mandatory. Do I have to leave this out and implement checking for existing email addresses myself in the account registration process?

Or is there a nicer way to handle this scenario?

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