[FEATURE REQUEST] Email Validation in the footer to check for approved domains like .com, .in, etc

## Description

**Is your feature request related to a problem? Please describe.**
The current system accepts any email address during form submissions, potentially leading to invalid or irrelevant entries. This can create issues with data integrity and hinder communication efforts.

**Describe the solution you'd like**
Implement email validation with domain filtering to ensure submitted email addresses:

- Follow a valid format (username@domain.tld).

- Belong to pre-defined approved domains (e.g., .com, .in, etc.).

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

## Additional Information

**Context**
Provide any additional context or information that helps explain the feature request.

**Potential Implementation** (optional)
If you have any ideas or suggestions on how the feature could be implemented, please share them here.

**Screenshots or Mockups** (optional)
The below image shows that the email id with domain .xyz is a valid email which is not correct.


**Priority** (optional)
Please indicate the priority level of this feature request (e.g., High, Medium, Low).

**Additional Notes** (optional)
Add any other notes or comments about the feature request here.