Check whether the email has the format local-part@domain
Verify that it contains exactly one @ symbol
Ensure the local part is not empty
Ensure the domain part is not empty
Check that the domain contains at least one dot
Confirm there are no spaces in the email address
Validate allowed characters in the local part
Confirm the domain name uses valid characters
Check that the top-level domain is present and valid
Use a regex pattern for basic format validation
Send a verification email with a confirmation link or code
Check MX records for the domain
Use an email validation API or service
Detect disposable or temporary email domains
Confirm the mailbox exists through SMTP verification when possible