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I received an email, and the sender's name is User X, but the email address is [email protected].

How is this possible? Are there any extra information that is sent in an email?

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Yes, the header of the email is written as follows: Title <[email protected]>

If the email address is written using that format, a client will understand that the Title is the name, and only displays that, but uses the email address as actual method of knowing where to send the email to.

The headers of an email will show something like this:

TO: You <[email protected]>
FROM: Me <[email protected]>
Date: 1-1-1970, 0:00
Title: Hello you

Email message

If you change the TO: to not have < and >, it will assume the whole string is an email address and if its not just the email address, it will fail.

So if it is You [email protected] it will fail because you [email protected] does not exist. There is a you user, but not a you you user. If you just write you, it will fail because it cannot understand the domain you.

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