Which of the following statements is true about an invalid email address?

An invalid email address refers to an address that either does not exist, is improperly formatted, or has been deactivated. Once an email address is identified as invalid, it is best practice to remove it from the mailing list. This action helps maintain the overall health of the email database and improves deliverability rates by reducing the chances of sending emails to addresses that cannot be contacted. Keeping invalid email addresses in the database can lead to higher bounce rates, which can negatively affect sender reputation and hamper future campaigns.

Maintaining a clean mailing list enhances engagement and ensures that legitimate subscribers receive communications, thus simplifying list management and compliance with regulations related to email marketing.