What are soft and hard bounces?

When an email is rejected by a subscriber's email server it is called a bounce. There are basically two types of bounces:
Soft Bounce: A soft bounce is a temporary error in email delivery. Mailblast will automatically convert subscribers who soft bounce at least 3 times in a 4 week window into hard bounces.
Some common examples of a soft bounce can be:
  • Mailbox is full
  • The recipient email server is offline
Hard Bounce: A hard bounce is a permanent failure in delivery of an email. Hard bounced recipients are immediately disabled from receiving any future emails from the respective list.
Some common examples of a hard bounce can be:
  • Recipient email address does not exist
  • Recipient mail server has blocked delivery of your email