fix(tem): add info (#5385)

Author: ldecarvalho-doc

pages/transactional-email/how-to/manage-blocklists.mdx

@@ -41,13 +41,17 @@ You can manually add addresses to your blocklist in the Scaleway console. Once a
 
 ## How to monitor temporary blocklists
 
-If any of your emails bounced, you will see a temporary blocklist entry, with a duration of 48 hours, containing the details of the email that bounced and the reason, or flag. Some examples of bounce reasons are:
+If any of your emails bounced, you will see a temporary blocklist entry containing the details of the email that bounced and the reason, or flag. Some examples of bounce reasons are:
 
   - `Mailbox full` - when the mailbox is full
   - `Mailbox not found` - when mailbox does not exist
 
 The temporary blocklist entry is created automatically to prevent repeated attempts to send emails, which could damage your reputation.
 
+<Message type="important">
+  The duration of a temporary blocklist depends on whether or not the an automatic blocklist has already been created for the recipient email. If it is the first blocklist automatically created for the email, the blocklist duration is of 1 week. If a blocklist was already automatically created for the email once, blocklist duration is of 1 month.
+</Message>
+
 To see the blocklist:
 
 1. Click **Transactional Emails** in the **Domains & Web Hosting** section of the [console](https://console.scaleway.com/) side menu. Your domains display.