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What are bounces
A
Written by Angelika Nilsson
Updated over a week ago

In the reports from your newsletter sendings you can see how many email messages that have bounced. A bounced
email is an email that for some reason could not be delivered to the recipient.


Bounces can be divided into different categories:


Hard bounces - A hard bounce is typically due to the e-mail address not being valid. The e-mail address might
be misspelled or non-existing or the email account might also have been closed.


Soft bounces - A soft bounce means that the e-mail address does exist, though the recipient's inbox might be
full and can therefore not receive any e-mails.


Technical bounces - This type of bounce might be due to a temporary problem at the recipients e-mail server.
The server might not have been available at the time of the sending, it might be temporarily down, overloaded
etc.


Other bounces - We do not have any information for this type of bounce, due to the fact that the recipientʼs
server has not sent back any information to our sending servers.


Invalid recipientPlease note that emails that have been stopped by spam filters do not always result as bounced messages.
The email address is either misspelled, or does not exist.In the bounce statistics in your reports you might find the following bounce categories and reasons:

Category

Reason

Description

Hard

General hard bounce

Failed to deliver the message due to unspecified permanent error.

Hard

Invalid recipient

The email address is either misspelled, or does not exist.

Hard

Bad domain

The domain name is either misspelled, or does not exist.

Hard

Address error

The email address might contain invalid characters.

Hard

Closed account

The recipient's mailbox has been closed.

Soft

Mailbox is full

Recipient's mailbox is full or has exceeded storage allocation.

Soft

Server is currently too
busy

Unable to deliver the message to the recipient due to temporary error on
receiving side.

Soft

Account is inactive

The recipient's mailbox is inactive.

Soft

Data format error

Format error somewhere in the data.

Soft

General error

Failed to deliver the message due to unspecified reasons.

Soft

Network error

Unable to deliver the message due to a network related error.

Soft

Other receiver error

Failed to deliver the message due to unspecified reasons on receiving
side.

Technical

Server is currently too
busy

Unable to deliver the message to the recipient due to temporary error on
receiving side.

Technical

Network error

Unable to deliver the message due to a network related error.

Technical

Other receiver error

Failed to deliver the message due to unspecified reasons on receiving
side.

Other

Other

Unknown reasons

Other

Unknown

Unknown reasons


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