# Email address archiving, removing hard-bouncing addresses, unsubscribes To manually add a contact to the archive, first go to the contacts list, select the contact, and then check it using the checkbox. After selecting the contact, simply click the **Archive** button to move the selected address or number to the archive. This ensures that these addresses will not be considered in future campaigns. Additionally, after each sent email campaign, a report appears with an option to archive undelivered messages. This functionality allows for the automatic transfer of addresses that received a **hard bounce** (i.e., in the case of email). A **hard bounce** means that the message could not be delivered to the recipient, most often due to a non-existent email address or server error. Addresses moved to the archive due to a hard bounce are automatically excluded from future email sends and will not be accepted during new data imports. Moreover, if an email recipient clicks on the unsubscribe link (e.g., in the message footer) and confirms their unsubscription, they will also be moved to the archive. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.messageflow.com/email/e-mail-campaigns/analytics-audiences-and-reports/email-address-archiving-removing-hard-bouncing-addresses-unsubscribes.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.