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SMTP Authentication at Site5


For added security and spam protection, we’ve ensured that pop-before-smtp connections are disabled on our servers. What this means is that every outbound mail connection (SMTP connection) must be authenticated and can not just be sent without logging in.

Of course, having this added layer of security does produce errors when connections are not made properly. If your email is being sent using a connection that has not been authenticated, you may see an error such as this:

[]:49593 is not permitted to relay through this server without authentication.. Please check the message recipient [email protected] and try again.

If you do run into a problem such as this, the solution would be to ensure SMTP Authentication is enabled within your email app or script. If you have difficulties configuring SMTP authentication within your email client, please feel free to reach out to our support staff!

Once SMTP authentication has been enabled in your mail client, you should see no further problems sending mail!

Still have a question? Or need help?
If you need technical support with your account, please email us or chat live with a representative.


  • good morning
    I can not send emails from otulook I have many accounts which can not send any mail. What can be done? It is urgent. Thank you

    • Hello Jonathan,

      Have you made sure to enable SMTP authentication as mentioned here? If so, and you are still seeing this error, I would recommend you contact our support team via a chat, and we can get this working for you.

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