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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. 
EMAIL_PROVIDER: "resend|nodemailer"
You must also set the sender name and email address for all providers as follows; 
EMAIL_FROM_NAME: "Postiz Emailer"
EMAIL_FROM_ADDRESS: "postiz@example.com"

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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.
EMAIL_PROVIDER="resend"
RESEND_API_KEY="<your-api-key-here>"

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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. 
EMAIL_PROVIDER: "nodemailer"
EMAIL_HOST: "smtp.gmail.com" # smtp host if you choose nodemailer
EMAIL_PORT: "465" # smtp port if you choose nodemailer
EMAIL_SECURE: "true" # smtp secure if you choose nodemailer
EMAIL_USER: "user" # smtp user if you choose nodemailer
EMAIL_PASS: "pass" # smtp pass if you choose nodemailer