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An SMTP user provides you with the credentials you need to authenticate when sending email with Helo via SMTP.
  • Host:
  • Port: 587 (recommended), 25, 2525, or 465.
  • Username: YOUR_SMTP_USER_ID
  • Password: YOUR_SMTP_USER_PASSWORD

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Create a new SMTP user

You can create, edit, and delete your SMTP users in the SMTP users section in your Helo account. There’s no limit to how many SMTP users you can create.
Tip: Create dedicated credentials for your testing environment. If you’re using a Sandbox Channel to test your email integration, set up a dedicated SMTP user to work with that Channel only. That way, you can neatly separate testing credentials from any production credentials.

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Mail type settings

When you create a new SMTP user, you need to specify the mail type you’d like to send via this SMTP user. Select either Transactional or Broadcast based on your sending needs. A SMTP user can only send one type of mail. If you need to send broadcast and transactional mail, set up a dedicated SMTP user for each of those mail types. Learn more about the difference between broadcast and transactional mail.

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Scoping to a Channel

You must also select which Channel your SMTP user can send through. An SMTP user can only be scoped to a single Channel. If you need to send mail through multiple Channels, create a dedicated SMTP user for each one.

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Good to know

  • For security, Helo only shows the SMTP user password once, at creation time. If you lose it, you’ll need to create a new SMTP user.
  • You can delete an SMTP user at any time from the SMTP users section — this immediately revokes it, and any requests made with it will begin failing after a short time.