How about temp-mail.org/en/
Temp Mail - Disposable Temporary Email
Keep spam out of your mail and stay safe - just use a disposable temporary email address! Protect your personal email address from spam with Temp-mail
temp-mail.org
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Can we all agree on a special designer email / password so I can come into your UI, poke around and play with all the buttons and screens without needing to sign up? I promise I won't break anything, I just want to play with your toys.
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Yeah I end up using these services all the time because of this. I'm suggesting that we have one secret designer email / pass for every company that designers can use to poke around in each others products 😄