JangoMail utilizes a Global Suppression List that is applied to all JangoMail/JangoSMTP accounts. When any user sends an email that results in a definitive bounce, this email address is added to the Global Suppression List (formerly known as System-Wide Block List).
If you attempt to send a message to an address that's on the Global Suppression List, JangoMail accepts the message, but doesn't send it. For broadcast senders, you will see these suppressed and removed during preprocessing. For transactional senders via SMTP relay, you will get a SMTP relay error. For transactional senders via API, you'll receive a failure. Receiving this type of send error is the only way to know if an address is on the global suppression list. You can't query the global suppression list.
Removing an address from the Global Suppression List
If you believe an email address to be valid, you may log in to your account to request removal.
1. Go to Reports > Management Reports & Tools > Global Suppression List.
2. Enter the email address to be removed and click to submit. If the email address you enter is on the Global Suppression List, we will remove it immediately.
Note: You may request removal of one email address at a time, up to 5 per hour.