Below are the different contact statuses and what they mean:
Active
Active contacts are people who have not opted out and continue to receive messages from you.
Opted Out
An opted-out contact is someone who has chosen to stop receiving messages from you. The most common way people opt out is by texting STOP to your number or clicking the unsubscribe link in their email. Once they are opted out, our system will no longer send them messages, and they will appear under your opt-out contacts.
Pending
When using our optional double opt-in feature via a keyword or API, a contact will receive an initial message asking them to agree to be added to your list. If they disagree, they remain in pending status.
Invalid
Invalid contacts are categorized as numbers or email addresses to which we can't send messages.
Examples include:
home phone number
an expired number
a number that does not even exist
a bad email address
a full email box
an old email account.