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Hashing an email is a cryptographic security method that transforms an email address into a random code using mathematical techniques. Hashing can be performed with three standard hashing functions: MD5, SHA1, and SHA256.
Why? Benefits of a hashed email address
Email marketers can use hashed email addresses to gain insights about their customers and leverage with third-party partners without intruding on customer privacy. It is a good practice to manage email lists.
How to hash a list of email addresses?
The easy peasy lemon squeezy way
Touchless PII Hasher app is a “free” utility that will hash a list of emails very quickly and easily. The hashed list can then be downloaded and used for your marketing programs.
I cannot say that this particular option is safe for certain uses. The reason is that in their privacy policy, they mention selling the information they collect. However, if you provide only an email address without any other identifying information or connection to interests, then that email address is essentially useless for commercial use.
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