hard bounce

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hard bounce

An undeliverable e-mail message. It is returned to the sender as "host unknown" or "recipient unknown," due to an invalid e-mail address or possibly an expired address. A hard bounce may also occur if the receiving mail server has been configured to block all mail from the sender's domain. For example, an ISP may block a known spammer. Hard bounces are permanent for that address unless there is a deliberate change, and the address is later restored as valid.

The Soft Bounce
Contrast with "soft bounce," which is mail that is returned because the recipient's mailbox may be full, the attachment size is too large or due to some connection problem. A soft bounce is often temporary.
References in periodicals archive ?
Deliverable, Undeliverable and Unknown/Soft Bounce) Unknown, or soft bounce, records are email addresses that EMM was not able to deliver during live sending, however, their true deliverability status is not yet known.
You can see if your email was read, whether it was a hard bounce, soft bounce, clicked on, opened, unsubscribed or was successful in obtaining a donation.
The song was dismissed by some Londoners as mere speed garage rehash, but the thing about bassline is that it turns speed garage's cold cavern into a warm tent; the openness is still present, but the crunch is replaced with a soft bounce.
A major concern was how soft bounce (undelivered) email messages quickly became categorized by some service providers as hard (permanently undeliverable) bounces and moved off a database by vendors concerned that if they didn't move aggressively, the self-appointed SPAM police would block all their messages.
The number of emails delivered excludes all measurable failures including technical failures, blocks, hard bounces, soft bounces, and other failures.
Total failure rates, which include blocks, technical failures, hard bounces and soft bounces, dropped from 11.
Soft bounces (unsuccessful delivery for reasons such as full inbox), account for 47% of bounces, or 5.