Solved

Emails failing to just a few recipients

Posted on 2014-10-07
4
206 Views
Last Modified: 2014-10-11
We are getting emails rejected with "Delivery has failed to these recipients" or "Delivery is delayed to these recipients" messages from just a handful of customers, most emails get through no problems, I have performed the SMTP check with mxtoolbox and the results are below,

Connecting to xxx.xxx.xxx.xxx

220 remote.mydomain.com Microsoft ESMTP MAIL Service ready at Tue, 7 Oct 2014 20:41:30 +0100 [686 ms]
EHLO MXTB-PWS3.mxtoolbox.com
250-remote.mydomain.com Hello [64.20.xxx.xxx]
250-SIZE 10485760
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH
250-8BITMIME
250-BINARYMIME
250 CHUNKING [764 ms]
MAIL FROM: <supertool@mxtoolbox.com>
250 2.1.0 Sender OK [749 ms]
RCPT TO: <test@example.com>
550 5.7.1 Unable to relay [5756 ms]

MXTB-PWS3v2 9376ms


Now the problem is our A record is mail.mydomain.com so I have run the following command in Exchange managment shell,

set-sendconnector “Windows SBS Internet Send mydomain” –fqdn mail.mydomain.com

and also tried  changing the FQDN in the Exchange managment console GUI but nothing is changed? it remains as remote.mydomain.com ?

Any ideas? I'm sure I am just mssing somthing obvious ;)

(this is on SBS2008 with Exchange 2007)

Thanks all
0
Comment
Question by:Leigh2004
  • 2
  • 2
4 Comments
 
LVL 76

Accepted Solution

by:
Alan Hardisty earned 500 total points
Comment Utility
As you have SBS - you need to use the Wizards in the SBS console to change things - don't change them manually.

You also don't need to change the Send Connector FQDN - but you do need to make sure your Reverse DNS record on your Public IP Address is set to remote.yourdomain.com and that you have an A record called remote for your domain that points to your Public IP address.

Then you might find fewer sending problems

Have a read of my article for other guidance:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/A_2427-Problems-sending-mail-to-one-or-more-external-domains.html

Alan
0
 

Author Comment

by:Leigh2004
Comment Utility
Thanks Alan, I have run the Reverse DNS lookup from dnsgoodies and get the following result,

Server: 4.2.2.1
Address: 4.2.2.1#53

Non-authoritative answer:
xxx.xxx.xxx.xxx.in-addr.arpa name = no-dns-yet-assigned.vfast.co.uk.

Authoritative answers can be found from:


I guess thats the problem you describe in the first part of your guide, right?
0
 
LVL 76

Expert Comment

by:Alan Hardisty
Comment Utility
Yep - that means you don't have a proper Reverse DNS setup, so please setup your A record for remote.yourdomain.com first and then ask your ISP to configure Reverse DNS on that IP as remote.yourdomain.com and then once added, please test again and things should be happier.

If you want - ping a test email to testmail @ sohomail.co.uk and my Anti-Spam may well reject you - and tell you why!

Alan
0
 

Author Comment

by:Leigh2004
Comment Utility
Thanks Alan, I had our ISP set the reverse DNS all is good now, and I spent so much time looking at the exchange server for no reason ;)
0

Featured Post

What Security Threats Are You Missing?

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

"Migrate" an SMTP relay receive connector to a new server using info from an old server.
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…
To show how to generate a certificate request 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 >> Certificates…

771 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