Algorithm for creation of e mail id

Here is a step-by-step algorithm for creating an email ID:

Input:

Domain name (e.g., gmail.com, yahoo.com, etc.)
Username (e.g., john, smith, etc.)

Output:

Email ID (e.g., [email protected], [email protected], etc.)

Algorithm:

Check if the domain name is valid:
- Verify that the domain name is a valid top-level domain (TLD) or a valid subdomain of a TLD.
- For example, "gmail.com" is a valid TLD, while "example.gmail.com" is a valid subdomain.
Check if the username is valid:
- Verify that the username is a valid string of characters, consisting of:
  - Alphanumeric characters (letters and numbers)
  - Underscores (_)
  - Dots (.)
- For example, "john" is a valid username, while "john!" is not.
Combine the domain name and username:
- Concatenate the domain name and username using the "@" symbol as the separator.
- For example, "[email protected]" is the resulting email ID.
Check for duplicate email IDs:
- Verify that the created email ID does not already exist in the domain's database.
- If a duplicate email ID is found, generate a new username and repeat the process.
Return the created email ID:
- Return the created email ID, which is the combination of the username and domain name.

Example:

Input:

Domain name: gmail.com
Username: john

Output:

Email ID: [email protected]

Pseudocode:

function createEmailID(domainName, username) {
  // Check if domain name is valid
  if (!isValidDomainName(domainName)) {
    return null;
  }

  // Check if username is valid
  if (!isValidUsername(username)) {
    return null;
  }

  // Combine domain name and username
  emailID = username + "@" + domainName;

  // Check for duplicate email IDs
  if (emailIDAlreadyExists(emailID)) {
    // Generate a new username and repeat the process
    return createEmailID(domainName, generateNewUsername());
  }

  // Return the created email ID
  return emailID;
}

function isValidDomainName(domainName) {
  // Check if domain name is a valid TLD or subdomain
  //...
}

function isValidUsername(username) {
  // Check if username is a valid string of characters
  //...
}

function emailIDAlreadyExists(emailID) {
  // Check if email ID already exists in the domain's database
  //...
}

function generateNewUsername() {
  // Generate a new username
  //...
}

Note that this is a simplified algorithm and may not cover all edge cases or security considerations. In a real-world implementation, you would need to consider additional factors such as email ID length limits, character sets, and security protocols.

Mail Knowledge

Algorithm for creation of e mail id