Error: SMTP Error 515

What's Causing This Error

SMTP error 515 occurs when the recipient's email or mailbox address is invalid or does not exist. It is usually the cause of incorrectly spelled email addresses. This issue may arise when attempting to send bulk emails, as it is easy to include invalid emails within multiple email addresses.

Solution - Here's How To Resolve It

It is essential that no email addresses contain invalid characters or syntax and that all email addresses are valid.