Which of the following can’t be a valid email ID?
2023
Which of the following can’t be a valid email ID?
- A.
An email ID having multiple ‘@’
- B.
An email ID having multiple ‘.’ (dots)
- C.
An email ID having multiple ‘ ’ (underscore)
- D.
An email ID having multiple digits (0–9)
Attempted by 2344 students.
Show answer & explanation
Correct answer: A
Correct answer: An email ID having multiple '@' cannot be a valid email address.
Reason: An email address must contain exactly one '@' character that separates the local part and the domain. If there are multiple '@' characters, the required separation is broken and the address is syntactically invalid.
Dots: Multiple dots are allowed in the local part but cannot start or end the local part and cannot occur consecutively. In the domain part, dots separate labels (subdomains) and multiple dots are normal for multi-level domains.
Underscores: Underscores are permitted in the local part and may appear multiple times. However, standard DNS domain labels do not allow underscores, so an underscore in the domain part would be invalid.
Digits: Digits (0–9) are allowed in both local part and domain labels; having multiple digits does not make an email address invalid.