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Blocks, Bounces, and Drops

Blocks, Bounces, and Drops

Email blocks, bounces and drop codes in ActiveDEMAND.


A block is when the email server you are sending to refuses your email. There can be lots of reasons for this:

they might decide you are spam,
that you violate an internal policy they have,
or the user you are sending to, may no longer exist on the mail server.


A bounce is an email that will be sent back to you because of some error; bounces can be categorised as hard-bounces or soft-bounces.

Soft-bounces are 4xx error level and are often temporary. A soft-bounce will reach the recipients email server, and then be sent back due to a full destination inbox, a server error, or an email address that no longer exists.

Hard-bounces are 5xx error level and are permanent failures; hard bounces will be sent back because of an invalid address.

Can I resend to bounced or unsubscribed emails?

Do you have a list of bounce codes?


A drop is if it has already bounced, or if it is invalid. These occur to help protect sender reputation.

Updated on: 11/10/2022

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