Solved

550 5.5.0 Invalid EHLO/HELO domain

Posted on 2010-11-18
4
7,992 Views
Last Modified: 2012-06-22
I'm trying to send an e-mail to a mail server from my Exchange Server 2007 but I got an error:  550 5.5.0 Invalid EHLO/HELO domain

What should I do?

Thanks.
0
Comment
Question by:anovaes
4 Comments
 
LVL 35

Expert Comment

by:Ernie Beek
ID: 34162898
0
 
LVL 23

Expert Comment

by:Dr. Klahn
ID: 34162926
The only thing that follows SMTP HELO or EHLO is the connecting system's fully-qualified name, e.g.

HELO mail.yahoo.com
EHLO smtp.somewhere.org

"Invalid EHLO/HELO domain" is a peculiar way to phrase this error message.  Two possibilities come to mind:

a) It directly refers to the HELO/EHLO fully-qualified name.  The only thing that can be wrong is that the fully-qualified name is somehow unacceptable to the receiving system's SMTP server.

b) It indirectly refers to the fully-qualified name in the HELO/EHLO.  What it really means is "Your name is badly formed," "I can't do an RDNS on your name," or "I've got a blacklist and you're on it."

There are some other possibilities as well.  See the description of SMTP status 550 at this PDF page

0
 
LVL 76

Accepted Solution

by:
Alan Hardisty earned 500 total points
ID: 34163023
Check your SEND connector - look at the General Tab and specifically, the FQDN entered there.  If it ends .local, which it might - that will be your problem.

Change it to something like mail.domain.com to match your MX record and Reverse DNS record, which you should have setup correctly too.
0
 

Author Closing Comment

by:anovaes
ID: 34260047
That's it.
0

Featured Post

Integrate social media with email signatures

Is your company active on social media? Do you also use email signatures? Including social media icons in your email signature is a great way to get fans for free. Let all your email users know you’re on social media quickly and easily, in a single click.

Join & Write a Comment

Resolve Outlook connectivity issues after moving mailbox to new Exchange 2016 server
Follow this checklist to learn more about the 15 things you should never include in an email signature from personal quotes, animated gifs and out-of-date marketing content.
To show how to create a transport rule in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Rules tab.:  To cr…
The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager

708 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now