How to get an email id if I have the mobile number?

Hi, We have a lot of customer database and while initial collection we couldn't capture the email id's. Since it is cumbersome to call and ask for email id's. Are there any hacks to get the email id's associated with mobile number.

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Reply to: How to get an email id if I have the mobile number?
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Re: hacks

Here in Europe it would be illegal, due the privacy rules in the GDPR. You don't want to do illegal things, do you?

Those email addresses are maintained by Google (you have to provide an email address to be able to use the Play Store) and Apple (for the App store and iCloud). So you should ask them.

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Message-ID in email header

There is a universal way of obtaining an email message's Id. In the email header, the Message-ID field holds an Id for the email message. You can find this in the Original of the message. This is also known as the source. As long as the metadata does not contain personal data, it is legal. All ticketing systems utilize some form of metadata for identifying messages. One example of metadata is, Subject. Scripts can extract the Message-ID from an email message. Headers of emails are looked at for this. However, it is important to get legal advice regarding the limitations in Europe. The key is to be able to organize emails in databases within the law.

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It was useful, Thank you. 

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