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In order to send emails from your Hudu, you will need to provide a SMTP server.
If you are looking for a free (for the number of emails Hudu has to send out), easy one to set up, we recommend SMTP2GO. You can test the SMTP connection by going to the Hudu Admin > Self-Hosting Center > SMTP Test, when logged in to your instance.
Example credentials for different providers.
Amazon SES
SMTP_DOMAIN=mydomain.com
SMTP_ADDRESS=email-smtp.region-1.amazonaws.com
SMTP_PORT=587
SMTP_STARTTLS_AUTO=true
SMTP_USERNAME=IAMMailerKey
SMTP_PASSWORD=IAMmailerSecret
SMTP_AUTHENTICATION=login
SMTP_OPENSSL_VERIFY_MODE=
SMTP_FROM_ADDRESS=
SMTP2GO
SMTP_DOMAIN=example.com SMTP_ADDRESS=mail.smtp2go.com SMTP_PORT=2525 SMTP_STARTTLS_AUTO=true SMTP_USERNAME=example.com SMTP_PASSWORD=testpass SMTP_AUTHENTICATION=login SMTP_OPENSSL_VERIFY_MODE=none
Office 365
SMTP_DOMAIN=mydomain.com
SMTP_ADDRESS=smtp.office365.com
SMTP_PORT=587
SMTP_STARTTLS_AUTO=true
SMTP_USERNAME=username@yourdomain.com
SMTP_PASSWORD=password
SMTP_AUTHENTICATION=login
SMTP_OPENSSL_VERIFY_MODE=none
SMTP_FROM_ADDRESS=username@yourdomain.com
Gmail.
Be aware that Gmail has strict sending limits. For growing organizations, please look into using a transactional email service like Amazon SES or Mailgun.
SMTP_DOMAIN=smtp.gmail.com
SMTP_ADDRESS=smtp.gmail.com
SMTP_PORT=587
SMTP_STARTTLS_AUTO=true
SMTP_USERNAME=username@gmail.com
SMTP_PASSWORD=password
SMTP_AUTHENTICATION=login
SMTP_OPENSSL_VERIFY_MODE=none
SMTP_FROM_ADDRESS=username@gmail.com
With Gmail, try turning on 2-step validation and using an application password. Alternatively, enable less secure apps to access the account.