How to fix error: Remote host said: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

I have received the error: Remote host said: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)  as well as simply error: Remote host said: Invalid HELO string (mailserver).

I use Outlook 2013 to send the messages and have it checked that my outgoing mail server uses SMTP authentication checked as well as use same settings as incoming mail.

I use SmarterMail on my mailserver also.

How do I fix this error so all of my messages get to their intended recipients?
lkretzBKAsked:
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Richard AmissConnect With a Mentor Owner/Developer/ConsultantCommented:
All mail servers must provide a valid ehlo.  Here is how to set this up SmarterMail:

- Login as admin
- Go to: Settings -> General Settings -> Server Info
- Set the hostname to your valid SMTP mail server address. (ie mail.yourdomain.com)

Also: Make sure you have your ISP create a Reverse DNS PTR record for the server ip to resolve back to mail.yourdomain.com

Richard
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lkretzBKAuthor Commented:
I have a feeling that this was never set up correctly.

When I log in as administrator and go to the server info - there is a message telling me there should be a fully qualified domain name.  So...maybe I need to start all over again? Does the information look correct in the attached screenshot?

I'm not sure what the qualifying mail address would be.
GeneralSettingsTab.jpg
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Hypercat (Deb)Connect With a Mentor Commented:
Richard stated you need the fully qualified domain name in that field.  This would be the full server.domain.com name that external email servers use to send to your mail server. So, if your domain is "domain.com" and your external DNS zone has a host and an MX record that point to "mail" for your email server, then the FQDN in that field would have to read "mail.domain.com."  You have to know what that external name is before you can properly complete that field.
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lkretzBKAuthor Commented:
Thank you. I believe I have the setting correct now. Thank you so very much for your assistance. The answer was to have mail.domainname.com
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lkretzBKAuthor Commented:
Because I felt they both had the correct answer - one was just a bit more detailed but they were the same - to me anyway.
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