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 does my form not send email?

To help prevent unauthorized users from abusing our system you must create the email account in...

Mozilla Thunderbird and Email Forwarding

The default forwarding method of Mozilla Thunderbird can result in servers blocking emails as...

550-not permitted to relay through this server

550-not permitted to relay through this server If you are receiving the above error, and the...

Updating Outlook SSL Certificate

You may want to install SSL for your email or update an existing certificate you had installed...