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#Email bounce handler full
#Email bounce handler series

"User unknown" means that the address is invalid. When you use old contact lists, you increase the chance of sending to non-existent domains, which is dangerous because non-existent domains can be spam traps. Sending to non-existent domains is a direct result of: "Domain not found" means that the domain is bad or non-existent. This bounce typically results when "domain not found" or "user unknown" errors occur. Hard bounces and ISP blocksĪ hard bounce occurs when the email server rejects the email due to permanent conditions. If necessary, the Acoustic Campaign Deliverability team can provide assistance. If the block is due to a poor quality email list, review the list and correct any problems before you send again. These addresses should not necessarily be removed from the email list. For example, Yahoo often uses these blocks when a sender is generating too many complaints, sender reputation is poor, or email server resources are overtaxed.

#Email bounce handler series

ISP blocks are also called "tempfails" or "4xx series errors" and are transient.

Presence of the sending IP address or domain on a blacklist.

ISP blocks occur when the receiving email server temporarily rejects the email for policy reasons, such as: There is a temporary failure at the receiving domain, which can occur for technical reasons, such as:

A temporary change in email use (for example, a vacation or change of jobs).

#Email bounce handler full

The recipient's mailbox is full or exceeded storage allocation, which can be caused by: Mailboxes can be disabled for several reasons (either temporary or permanent): Inactive accountsĪn inactive account indicates that the email address is temporarily unavailable because the recipient's mailbox is inactive or temporarily disabled. This problem happens occasionally and is ultimately determined by the receiving email server. In this case, it's possible the email server sent the delivery failure to your "reply to" address and ignored the bounce address. It's possible an email might bounce and the bounces are returned to the Acoustic Campaign bounce server, but you are not notified. Warning: Every email contains four addresses, Email recipient, "From", "Reply to", and Bounce. If the address cannot be verified, it should be permanently suppressed. However, if delivery issues persist, cease email and contact the subscriber through other methods to confirm the address. The timeout is set in Acoustic Campaign.įor soft bounces, you can continue sending to these subscribers for a short time to see whether the situation changes. When a soft bounce occurs, the system tries to send the email again until it is either accepted or times out.

Soft bounces and temporary failuresĪ soft bounce occurs when the email server rejects an email due to a temporary condition, such as a full inbox.

Continuing to send to invalid addresses is considered a dangerous practice and results in negative responses from ISPs (such as throttling, spamfoldering, and blocking). Review both soft and hard bounces regularly, either manually or by automation.

This process prevents the continued sending to invalid email addresses.

The number and type of bounces required to trigger suppression varies.

When an email bounces several times in a row, a process in Acoustic Campaign flags it for suppression. How does the Acoustic Campaign handle bounces? Bounce handling is a critical part of list hygiene and management. When an email cannot be successfully delivered, it is considered a bounce.īounces are one of the key pieces of data that ISPs use to determine IP address and domain reputation. Hard bounces and soft bounces are messages that ISPs send back to Acoustic Campaign to explain why they cannot deliver your email to the intended recipient.