Can we have mail id in caps

Yes, it is possible to have an email address in all capital letters, but it's not recommended. Here's why:

  1. Readability: Email addresses in all capital letters can be difficult to read, especially when written by hand or typed quickly.
  2. Uniqueness: Email addresses are case-insensitive, which means that "[email protected]" and "[email protected]" are considered the same address. Using all capital letters may make it harder to distinguish your email address from others.
  3. Conventions: Email addresses typically follow a standard format, with the local part (before the @ symbol) and the domain (after the @ symbol) separated by a dot. Using all capital letters may make your email address look less conventional.

That being said, if you still want to use an email address in all capital letters, you can do so. Just keep in mind the potential drawbacks mentioned above.

Here's an example of an email address in all capital letters:

[email protected]

Remember to always follow best practices for creating a strong and unique email address, such as using a combination of letters, numbers, and special characters, and avoiding common words or phrases that may make your email address more vulnerable to spam or phishing attacks.