Understanding and managing the blocklist

• You have access to the Splio platform with rights to the Data section.

• To manage the blocklist via the API, you have valid API credentials.

• You know which channel (email or SMS) you want to use.

Go to Data > Blocklists . This page centralizes blocked email addresses and mobile numbers. The view is organized into two tabs, one for each channel, and displays a counter of blocked contacts as well as search, filter, and export tools.

The Data > Blocklists page has two tabs, one per channel.

Several actions are available at the top of the list.

Each entry corresponds to a specific blocking source and indicates the reason for it. The source filter allows each blocking category to be displayed separately on both channels.

4.1 Sources of email blocking

4.2 Sources of SMS blocking

The SMS channel also has a filter based on source, on the same principle as email. Its sources differ slightly.

For most blocklists, blocking information is directly accessible from the contact's record. You can see the source of the blocklist, the reason for the block, and the date the contact was added.

1. Open Data > Blocklists .

2. Open the actions menu, then choose Ajouter des emails ou des numéros à la blocklist

3. Select the relevant channel: Email or SMS .

4. Enter the addresses or numbers in the text box. You can enter multiple addresses or numbers, one per line or separated by a comma.

5. Click Ajouter to confirm. Manually added entries will be included in the "custom blocklist".

You can also perform this operation via the API. See point 10 for more information.

1. Open the actions menu in Data > Blocklists

2. Choose Supprimer des emails ou des SMS de la blocklist

3. Enter the address(es) to be collected, then confirm.

You can only remove manually added entries and unsubscribes. Blocks resulting from a hard bounce, a soft bounce, or a spam complaint cannot be removed: they protect your sender reputation.

You can also perform this operation via the API. See point 10 for more information.

Email and SMS blocklists are independent: a contact blocked by email can still receive SMS messages, and vice versa.

However, be aware that in a single-list configuration (a single subscription list for both channels), unsubscribing from an email adds the contact to the email blocklist and revokes their consent. Without this opt-in, they no longer appear in the filters and therefore no longer receive SMS messages. On the other hand, a hard bounce from an email does not affect their subscription lists: they remain reachable by SMS.

In a multi-list configuration, unsubscribing from one list only affects that list. The contact can remain opt-in to other lists.

If you use Splio's SMTP relay, especially for your transactional emails, be aware that it has its own blocklist, separate from that of your universe.
This separation is voluntary: a contact who no longer wishes to receive your marketing communications can legitimately continue to receive a transactional email, such as an order confirmation or a password reset.

All blocklist management actions available in the interface can also be performed via the API, but are not accessible from the Datahub.

The following operations are available:

• Add addresses to a blocklist: POST /data/blacklists/{channel}

• Remove addresses from a blocklist based on their source: DELETE /data/blacklists/{channel}/{source}

• View or export blocked email addresses: GET /data/blacklists/emails

• View or export blocked phone numbers: GET /data/blacklists/cellphones

The channel parameter can take the values email or cellphone .

The complete reference, including request and response formats, is available on the Developer Portal .