Solved

Can't send email after removing smart host

Posted on 2013-01-24
4
1,353 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
  • 2
4 Comments
 
LVL 41

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 500 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 41

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

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
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 an email address policy 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…
In this video we show how to create a mailbox database 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 Servers >> Data…

929 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