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The user name and password of the SMTP+ user are not correct

  • Log into your admin console
  • Retrieve the SMTP+ credentials for that user
  • Re-enter them in the email client that is sending the messages
None

The sender's domain is not one of the authorized domains.

  • Log into your admin console
  • Review the details for the SMTP+ user that you are using
  • Make sure that the domain that you are using is authorized
You will typically need to enter a second-level domain, since email addresses are typically at the second level. That is: you will typically enter mycompany.com and not www.mycompany.com

You do not "need" to authorize at the domain level. You can authorize specific email addresses. It's whatever works best for you. See below.

The sender's email is not one of the authorized emails.

  • Log into your admin console
  • Review the details for the SMTP+ user that you are using
  • Make sure that the sender email that you are using is authorized
You do not "need" to authorize specific email addresses. You can authorize entire domains. It's whatever works best for you. See above.
The port used is not "open" in the Web server where the message is being sent.Try another port. For example, if you had to specify a port in the email client and you entered port 25, try changing that to 2525 (or another port supported by SMTP+). If nothing works, ask your server administrator which ports can be used.

SMTP+ supports a variety of ports: 23, 25, 26, 587, 1025 - 5000 (limits included)

The port used is not supported by SMTP+

SMTP+ supports a variety of ports: 23, 25, 26, 587, 1025 - 5000 (limits included) 

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