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Postiz supports two email providers: Resend and NodeMailer (SMTP). If you have an email provider configured, then new users will require activation.
You must also set the sender name and email address for all providers as follows;

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Resend

Postiz uses Resend to send email notifications to users. If this key is set, users will also require activation.
1

Register on Resend

Register to Resend, and connect your domain.
2

Copy your API Key

Copy your API Key from the Resend control panel.
3

Edit your .env file

Open the .env file and edit the following line.

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NodeMailer (SMTP)

This is an alternative to Resend. You can use NodeMailer, which is simply a SMTP library, to connect to any SMTP server.