Which of the following is not a valid email address?

Correct option is A

The email address myname#country@gmail.com is not valid because the ‘#’ symbol is not allowed in the local part (username) of an email address according to standard email formatting rules. Email addresses must follow a specific syntax defined by internet standards, and only certain special characters are permitted. Since the remaining options use allowed characters like dots (.), underscores (_), and hyphens (–), option (a) is the incorrect email address.
Important Key Points:
1. Standard Email Format: An email address follows the structure: local-part@domain-name.
2. Allowed Characters in Local Part: Letters (a–z), digits (0–9), dot (.), underscore (_), and hyphen (–) are commonly allowed.
3. Disallowed Characters: Special characters like #, %, &, /, spaces are not permitted in standard email IDs.
4. Domain Rules: Domain names must contain valid domain labels and extensions such as .com, .in, .org.
5. Why ‘#’ Causes Invalidity? The # symbol is reserved for special purposes in URLs and is not supported in email usernames.
6. Real-World Relevance: Incorrect email formats cause delivery failures and account creation errors.
Knowledge Booster:
· Why option (b) is valid? Uses an underscore (_) which is allowed in the local part.
· Why option (c) is valid? Dots (.) are permitted as long as they are not at the beginning or end.
· Why option (d) is valid? Hyphens (–) are allowed in both the local part and domain name.