1

we pass %%emailaddr%% to a webpage as query string value.

Can we encrypt the email on email send and webpage can decrypt it so email is never exposed?

NOTE: In this case webpage is a 3rd party site page (not cloud page or microsite)

2

You can base64 encode it with Base64 encode function, and decode it with javascript on the client side.

Reference:

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  • 2
    depending on the scenario/ organization base64 may not be deemed secure enough. if that's the case you could explore creating a API call to fetch the email address based on the subscriber key used. retreving data from a data extension – Luke Harrison May 8 '18 at 22:29

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