Email FAQ

What’s the difference between a hard bounce and a soft bounce?

- Soft Bounce:  A soft bounce is an email message that gets as far as the recipient's mail server (it recognizes the address), but is bounced back undelivered before it gets to the intended recipient. A soft bounce might occur because the recipient's mailbox is full, the server is down or swamped with messages, the message has malformed HTML, or the message is too large.

- Hard Bounce:  A hard bounce is an email message that has been returned to the sender and is permanently undeliverable. Causes include invalid addresses (domain name doesn't exist, typos, changed address, etc.) or the email recipient's mail server has blocked your server.