WhatsApp is now allowing users to verify their accounts using an email address in addition to a phone number. This new option is particularly useful for times when cellular coverage is poor or ...

These are usually not returned if an email address does not exist at all. Return codes starting with 5 – i.e. codes between 500 and 599, are reserved for permanent errors, which imply that the email ...

Keeping your email lists healthy and up-to-date requires the removal of invalid email addresses. These contacts often contain typos, cannot receive incoming emails, and have a high probability of ...