BounceReason

Why the message was refused. mailbox_unknown, mailbox_full, mailbox_disabled and domain_unroutable come with fault recipient; unclassified comes with fault unknown; every other reason comes with fault sender.

stringBounceReason

Why the message was refused. mailbox_unknown, mailbox_full, mailbox_disabled and domain_unroutable come with fault recipient; unclassified comes with fault unknown; every other reason comes with fault sender.

Possible values: [mailbox_unknown, mailbox_full, mailbox_disabled, domain_unroutable, blocklist, reputation, rate_limited, policy, content, authentication, sender_address, unclassified]

BounceReason

"mailbox_unknown"