Solved

451-4.4.0 Primary Target IP Responded With ESMTP Service Not Available

Posted on 2016-10-13
3
14 Views
Last Modified: 2016-10-20
Hi Guys

One of my clients has an issue being unable to send to a specific email address, they are running SBS 2008 and each time they attempt to send an email to address in the question, the message sits in the exchange queue and fails to send. I looked in Exchange Message Console and can see the following error is listed against the relevant queue "451-4.4.0 Primary Target IP Responded with: "554-gmx.net (mxgmx002) Nemesis ESMTP Service Not Available"

I have tested sending mail from my account and the recipient receives the email without any issues.

Any Ideas?
0
Comment
Question by:Daniel Bertolone
3 Comments
 
LVL 35

Accepted Solution

by:
Kimputer earned 500 total points
ID: 41842154
Usually, it's because the OTHER side is doing some checks on the connection.
Please check if the public IP on the SBS 2008 has a correct PTR record (nslookup IPnr should return a valid hostname).
Other things could be your IP address is blacklisted somehow (check with https://mxtoolbox.com/blacklists.aspx)
Also check you're talking to the correct server (DNS problem).
0
 
LVL 26

Expert Comment

by:skullnobrains
ID: 41849956
agreed

additionally performing a dns lookup on the valid hostname returned by the PTR query should return the inital IP address
0
 

Author Closing Comment

by:Daniel Bertolone
ID: 41852182
PTR record was the cause
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Resolve DNS query failed errors for Exchange
Scam emails are a huge burden for many businesses. Spotting one is not always easy. Follow our tips to identify if an email you receive is a scam.
In this video we show how to create a Distribution Group 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 Recipients >>…
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…

746 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

10 Experts available now in Live!

Get 1:1 Help Now