Can mail id case sensitive

In general, email addresses (also known as mail IDs) are case-insensitive, meaning that the same email address can be written in different cases and still be considered valid.

For example:

Most email providers and servers treat email addresses as case-insensitive, so you can usually send an email to [email protected] and it will be delivered to the same inbox as if you had sent it to [email protected].

However, there are some exceptions and considerations:

  1. Domain name system (DNS) resolution: When you enter an email address, your device sends a request to the DNS to resolve the domain name (e.g., example.com). The DNS resolution process is case-sensitive, so if the domain name is registered with a specific case (e.g., Example.com), you may not be able to send an email to example.com or EXAMPLE.COM.
  2. Email client and server configuration: Some email clients or servers may be configured to be case-sensitive, which means that they may treat [email protected] and [email protected] as different addresses.
  3. Special characters and formatting: Some email addresses may contain special characters or formatting that can affect case sensitivity. For example, if an email address contains non-ASCII characters (e.g., accents or non-Latin characters), the case sensitivity may vary depending on the email client or server.

In summary, while email addresses are generally case-insensitive, there may be exceptions and considerations depending on the specific email client, server, or domain name configuration.