In Invalid accounts, you can view email address accounts that have been reported as invalid by their hosting Internet Service Provider (ISP). For example, an ISP may report an email address account as invalid due to a nonexistent or canceled account. Typical causes of an invalid account occur when the email address contains a typographical error or the email account is canceled due to inactivity. Accounts that bounce email for another reason, such as a temporary network issue, a full mailbox, or a content filter, do not appear in Invalid accounts.
Note: For information about how the program handles accounts that bounce email but are still valid, see Bounced Email Management.
To prevent your email address from being blacklisted, the program does not send email to invalid accounts. For each email address in Invalid accounts, you can view the bounce error that caused the ISP to report the account as invalid. If you think an account was incorrectly marked invalid, you can mark it as valid to include it in mailings.