Valid email formats

Here are some valid email formats:

Basic Format

• Local part (username) followed by the @ symbol, followed by the domain name.
• Example: [email protected]

Character Restrictions

• Local part: Can contain letters (a-z, A-Z), numbers (0-9), and special characters (!, #, $, %, ^, &, *, _, -, +, =, ~, `).
• Domain name: Can contain letters (a-z, A-Z), numbers (0-9), and special characters (-,.).
• Example: [email protected]

Length Restrictions

• Local part: Typically limited to 64 characters.
• Domain name: Typically limited to 253 characters.
• Example: [email protected]

Valid Characters

• Alphabetic characters (a-z, A-Z)
• Numeric characters (0-9)
• Special characters (!, #, $, %, ^, &, *, _, -, +, =, ~, `)
• Dot (.) for the domain name
• Hyphen (-) for the domain name

Invalid Characters

• Spaces ( ) are not allowed
• Special characters that are not allowed in the local part or domain name (e.g., @, \, /, etc.)
• Example: john [email protected] (space is not allowed)

Examples of Valid Email Formats

• [email protected]
• [email protected]
• [email protected]
• [email protected]

Examples of Invalid Email Formats

• john [email protected] (space is not allowed)
• [email protected] (no domain name)
• john.doe@example (no top-level domain)
• [email protected] (multiple dots in the domain name)

Note: These are general guidelines, and some email providers may have additional restrictions or requirements for valid email addresses.