monaco meand ico guestbook and email address

What is a "primary" email address? – Customer Feedback for Credly

Your "primary" email address in Credly is the email address you use to login to your account, and it's the email we'll use to notify when you receive Credit from...

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A guestbook is a paper or electronic means for a visitor to acknowledge a visit to a site, physical or web-based, and leave details such as their name, postal or electronic address, and any comments...

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What is at sign (address sign or @)? - Definition from

In business, @ is a symbol meaning "at" or "each. ... He needed a way to separate, in the e-mail address, the name of the user from the machine the user was on.

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