?
Solved

Can't send email after removing smart host

Posted on 2013-01-24
4
Medium Priority
?
1,439 Views
Last Modified: 2013-01-24
Hi,

On a clients server running SBS 2011, I am unable to send mail to external domains. Previously they were using a smarthost send connector. The stopped paying for the connector, so today email stopped sending. I was unaware that they had the send connector, but after seeing the address as the next hop in the message queue, they mentioned it.

I disabled using smart host on the send connector, and set it to use DNS instead. I also tried recreating the send connector.

I then checked the message queue, and the external domains showed up. However, they end up with error:

 451 4.4.0 Primary target IP address responded with *.* Atempted failover to alternate host but did not succeed.

I ran the mail flow troubleshooter, and got no errors until the following on Remote Delivery Queue SMTP Commands analysis results:

Remote server **** failed the mail acceptance test. RCPT TO command: Respond = 554 5.7.1 <******@*****.com>: Relay access denied

I am unsure where to go from here.

Regards,

Kevin
0
Comment
Question by:ksagle
[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
  • 2
4 Comments
 
LVL 44

Expert Comment

by:Amit
ID: 38815564
Ask them to pay money and get back to production again. Setting up your own DNS server in Public Domain can be way costlier than using ISP smart host.
0
 
LVL 76

Accepted Solution

by:
Alan Hardisty earned 2000 total points
ID: 38815651
Smarthosts tend to use a port other than port 25, so check your firewall to see if port 25 is allowed out and if your ISP isn't blocking it too.

Can you telnet to mail.mydomain.co.uk on port 25?

Alan
0
 
LVL 44

Expert Comment

by:Amit
ID: 38815659
0
 

Author Closing Comment

by:ksagle
ID: 38815792
Hi guys,

Thanks for the help. You were correct, port 25 was being blocked. Added an exception and all is well.

Regards,

Kevin
0

Featured Post

Get your Conversational Ransomware Defense e‑book

This e-book gives you an insight into the ransomware threat and reviews the fundamentals of top-notch ransomware preparedness and recovery. To help you protect yourself and your organization. The initial infection may be inevitable, so the best protection is to be fully prepared.

Question has a verified solution.

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

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…
New style of hardware planning for Microsoft Exchange server.
In this video we show how to create an Accepted Domain 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 >> Ac…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
Suggested Courses
Course of the Month14 days, 16 hours left to enroll

770 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