550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

The 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) error can occur if your rDNS (reverse DNS) is not setup properly with a PTR record. What this means is your device is saying one thing but when checked in a different manner it responds with another. This is something your mail server administrator or internet service provider can assist you with.

In the case of receiving the error while using a mail account with our service, please ensure you have "My Server requires authentication" enabled and you are logging in to SMTP for outgoing email. This will bypass the check altogether.

You may also have an exception placed on your account for the remote IP by creating a support ticket with our service. 

 

  • 158 Users Found This Useful

Was this answer helpful?

Related Articles

Why can I not connect to the mail server?

There are several reasons why you may not be able to connect to the POP3 server, and thus, not be...

Outlook: The Message Could Not Be Sent. An Error Has Occurred.

When you try to send an e-mail message, you may receive the following error message: The...

What is email forwarding?

Email forwarding will automatically redirect any mail sent to an email address on your domain...

Server does not support TSL Connections

I received an error message when checking my email "Server does not support TSL Connections."...

Outlook: When Opening Outlook Express Macintosh Edition: An Error Occurred While

When you start Outlook Express for Macintosh, you may receive the following error message: An...