Brevo
From Planfix
To enable integration with Sendinblue Mailing Service, go to Account Management — Integrations — Email marketing services:
In the list that appears, activate Sendinblue:
Open Sendinblue on the next tab and log in. Then in the account menu, find the SMTP & API section:
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Click the "Create a new API key" button:
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Come up with a name:
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Copy the generated API key:
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Go back to the Sendinblue integration page in Planfix and paste it into the appropriate field:
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Save the changes. Afterward, you can automatically export selected contacts to Sendinblue in each contact filter.