Bit of a head scratcher and I'm stumped on this. Client has been using Incoming Email with SharePoint 2010 for years without issue. Now though emails are not being processed by the SMTP Service and all that happens is a bounceback is generated in the queue folder as below:
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
Some further information is in an attached text file:
Reporting-MTA: dns;ESP2010.DOMAIN.INTERNAL
Received-From-MTA: dns;EEX2010-CAS.DOMAIN.INTERNAL
Arrival-Date: Wed, 4 Jan 2017 13:45:42 +1100
Final-Recipient: rfc822;testlib1@esp2010.domain.local
Action: failed
Status: 5.4.0
5.4.0 appears a DNS error but I have confirmed that A records for the SP server still exists and when I check DNS in the SMTP settings it confirms DNS is OK.
I have uninstalled and reinstalled the SMTP role as per https://technet.microsoft.com/en-us/library/cc287879(v=office.14).aspx and other blogs on the steps and cannot find anywhere I am getting anything incorrect - I am merely using the single SP servers FQDN as the mail server name in all fields and the required A record for it exists.
I have enabled all SMTP logging and checked these logs and doesn't really give me anything, but just in case here is that output:
2017-01-04 02:45:42 192.168.221.22 EEX2010-CAS.domain.INTERNAL SMTPSVC1 ESP2010 192.168.221.59 0 EHLO - +EEX2010-CAS.domain.INTERNAL 250 0 200 29 0 SMTP - - - -
2017-01-04 02:45:42 192.168.221.22 EEX2010-CAS.domain.INTERNAL SMTPSVC1 ESP2010 192.168.221.59 0 MAIL - +FROM:<test.domain@domain.com.au> 250 0 48 47 15 SMTP - - - -
2017-01-04 02:45:42 192.168.221.22 EEX2010-CAS.domain.INTERNAL SMTPSVC1 ESP2010 192.168.221.59 0 RCPT - +TO:<testlib1@esp2010.domain.local> 250 0 39 36 0 SMTP - - - -
2017-01-04 02:45:42 192.168.221.22 EEX2010-CAS.domain.INTERNAL SMTPSVC1 ESP2010 192.168.221.59 0 BDAT - +<B4F4F42681FABF459350E07DDCF3E08996F181@EEX2010-MBOX.domain.INTERNAL> 250 0 104 155648 16 SMTP - - - -
2017-01-04 02:45:42 192.168.221.22 EEX2010-CAS.domain.INTERNAL SMTPSVC1 ESP2010 192.168.221.59 0 QUIT - EEX2010-CAS.domain.INTERNAL 240 234 69 4 0 SMTP - - - -
I have also found below in the System Log which is obviously relevant but again can't figure this one out:
Message delivery to the remote domain 'esp2010.domain.local' failed for the following reason: Destination server does not exist.