For AWS Marketplace publication, can an SaaS products collect user's email

Question

For AWS Marketplace publication, can an SaaS product collect user's email for the purpose of verifying their account?  
  
In our service, users provide a username and email to sign up. They then receive an email with a link to change their password. In future sign-in, they use only their username and password. Their password and email are securely stored in an AWS Cognito user pool.

Answer

Yes, it depend of your request. If you want user emails for sent some information regarding used service then collect it.

Answer

Yes, you as a SaaS seller can collect email information when the buyer is redirected to your SaaS application.   
  
More info on SaaS policy here: https://docs.aws.amazon.com/marketplace/latest/userguide/saas-guidelines.html#saas-customer-information

Answer

Yes. When creating your SaaS product listing, you provide a URL to your registration landing page. We use that URL to redirect customers to your registration landing page after they subscribe. On your software's registration landing page, you collect whatever information is required to create an account for the customer. We recommend collecting your customer’s email addresses if you plan to contact them through email for usage notifications.

https://docs.aws.amazon.com/marketplace/latest/userguide/saas-product-customer-setup.html

For AWS Marketplace publication, can an SaaS products collect user's email

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