To make Magical work on multiple devices with the same email, you will need to do the following:

Step 1: Register with Magical on computer #1

Step 2: On computer #2, and others, login with the same that you registered with on computer #1

The templates on computer #1 will transfer over to any computers that you sign in with. If you add a templates on additional computers, all other computers will be automatically updated as long as you are signed into the same account. Note, it may take up to 6 hours for data to sync across devices.
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If you are looking to have distinct email addresses that share common templates, this is a new feature that will be adding soon! Until then, send us a note at hello@getmagical.com and we can give you a quick way to share templates across multiple accounts.