Solved

SBS2008 Mail

Posted on 2013-12-12
7
225 Views
Last Modified: 2013-12-16
Hi,

We have a SBS2008 server that has been working fine. We just moved to a new ISP and MX records were change.

We have users who can receive mail but cannot send. Mail sits in the que. I reran the internet connection wizard and can't get things working. Any help would be great.
0
Comment
Question by:blackbear67
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 9

Expert Comment

by:tsaico
ID: 39715893
I would look at your return PTR and also what is in your SPF records.  Check out www.mxtoolbox.com for an external site to check things out.  put in your hostname, when it returns results, choose the SMTP test.  While you are there, I would also check the blacklist in case your new IP was already black listed before it became yours.  

In  many cases, if your PTR does not match your banner, then it will increase your Spam score or you might get rejected entirely.  This will be particularly true if there is a SPF entry that reflects old information, or if you are on a blacklist.
0
 
LVL 26

Accepted Solution

by:
ronnypot earned 500 total points
ID: 39716038
Hi,

Please check if your send connector in Exchange 2010 management console is nog configured to use a smarthost and there is a smart host configured from your old ISP.

Also check if your new ISP is not blocking port 25 some ISP's block port 25 and you have to send email via there smart host.

Last go to the Queue viewer in the exchange management console toolbox and in the view scroll to the most right there should be a comment why the emails are stuck in the queue.
0
 

Author Comment

by:blackbear67
ID: 39716081
The reverse DNS is ok no issues with MXtoolbox.

We did not previously use a smart host so none was configured. I will send an email (since we send out fine) and ask the new ISP if they are blocking 25. you may be on to something with the smart host. the error is 451 4.4 primary target IP address responded with 421 4.21 unable to connect to  attempt fail over to alternate host but did not succeed. either there are no alternate hosts or delivery failed to all alternate.
0
Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

 
LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39716103
The error you have posted means the server is unable to connect to the remote server. You have said that two users are unable to send. Is that tending to ANY recipient, or just unable to send to specific domains? It is very important because it indicates where the problem is.

If it is to specific domains then it could be a connectivity issue.

Simon.
0
 
LVL 37

Expert Comment

by:bbao
ID: 39716590
just public IP address and the corresponding DNS/MX records have been changed?

is the SBS2K8 sitting behind a firewall on a private address or directly having the public IP?
0
 
LVL 9

Expert Comment

by:tsaico
ID: 39720831
You can also try switching the Send connector to use DNS instead of a smarthost for a little bit.  Write that setting down if there is something in there, when you change it, it will not retain what value was in there.
0
 

Author Closing Comment

by:blackbear67
ID: 39721162
It was the new ISP blocking port 25.
0

Featured Post

Is Your AD Toolbox Looking More Like a Toybox?

Managing Active Directory can get complicated.  Often, the native tools for managing AD are just not up to the task.  The largest Active Directory installations in the world have relied on one tool to manage their day-to-day administration tasks: Hyena. Start your trial today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Lotus Notes – formerly IBM Notes – is an email client application, while IBM Domino (earlier Lotus Domino) is an email server. The client possesses a set of features that are even more advanced as compared to that of Outlook. Likewise, IBM Domino is…
It’s been over a month into 2017, and there is already a sophisticated Gmail phishing email making it rounds. New techniques and tactics, have given hackers a way to authentically impersonate your contacts.How it Works The attack works by targeti…
With the advent of Windows 10, Microsoft is pushing a Get Windows 10 icon into the notification area (system tray) of qualifying computers. There are many reasons for wanting to remove this icon. This two-part Experts Exchange video Micro Tutorial s…
how to add IIS SMTP to handle application/Scanner relays into office 365.

730 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