SMTP settings

Copy the exact values from your in-app Settings page. Most accounts use these defaults.

Action Mailer

Store your API key in credentials or environment variables, then configure SMTP in production.

# config/environments/production.rb
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  address: "smtp.parcelwing.com",
  port: 587,
  user_name: "parcelwing",
  password: ENV.fetch("PARCELWING_API_KEY"),
  authentication: :plain,
  enable_starttls_auto: true,
}
 
config.action_mailer.default_options = {
  from: "Acme <[email protected]>",
}

Use a verified sender

Your from address should belong to a sending domain that is verified in Parcel Wing. This keeps SPF, DKIM, and DMARC aligned for better deliverability.

Troubleshooting

• Use port 587 with STARTTLS, not implicit TLS on port 465.
• Use parcelwing as the username and an active Parcel Wing API key as the password.
• Make sure the sender address uses a verified sending domain.
• If a vendor has a test email button, send a test before enabling production email.