Why do i see mail to in red gmail

In Gmail, the "To" field is highlighted in red when you're composing a new email and you've typed in an invalid or non-existent email address. This is a feature designed to help you catch and correct mistakes before sending the email.

Here are some common reasons why you might see "To" in red:

1. Invalid email address: You've typed an email address that doesn't exist or is not valid. For example, if you type "example.com" instead of "[email protected]", the "To" field will turn red.
2. Non-existent domain: You've typed an email address with a domain that doesn't exist. For example, if you type "[email protected]", the "To" field will turn red.
3. Typo or incorrect formatting: You've typed an email address with a typo or incorrect formatting. For example, if you type "[email protected]" instead of "[email protected]", the "To" field will turn red.
4. Email address not recognized: You've typed an email address that Gmail doesn't recognize or can't verify. This might happen if you're trying to send an email to a domain that's not commonly used or is not recognized by Gmail.

When you see the "To" field in red, it's a good idea to double-check the email address you've typed to make sure it's correct. You can also use Gmail's auto-complete feature to help you find the correct email address.