All of a sudden I stopped recieving emails from certain domains

All of a sudden I stopped receiving emails from certain domains.  I can send to these domains, but not receive.  A big one I can't receive from is gmail.  I do an MX and DNS record check everything comes up fine.  Nothing has changed on the network.  The email is not even hitting my Astaro, which is what I use for email filtering, then is forwarded to exchange.  The Astaro is my MX record.  So the emails from gmail for example are not even hitting my network, and the gmail users have yet to get any kick back to even help troubleshoot the problem.  I also have a few other domains that I can't receive email from.  For the most part though we are getting all our email from other domains.  This started yesterday.
LVL 4
denver218Asked:
Who is Participating?
 
Jessie Gill, CISSPConnect With a Mentor Technical ArchitectCommented:
Has your public IP used for MX recored changed?
Also have you checked if your ISP has blocked SMTP traffic,
0
 
denver218Author Commented:
nope.  nothing at all has changed.  If you do a MX record and dns check all is fine.
0
 
Jessie Gill, CISSPTechnical ArchitectCommented:
if they are not even hitting your mail gateway, could thier be an issue with your ISP, are they having some issues?
0
Has Powershell sent you back into the Stone Age?

If managing Active Directory using Windows Powershell® is making you feel like you stepped back in time, you are not alone.  For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why.

 
Jessie Gill, CISSPTechnical ArchitectCommented:
I would send an email from gmail to your Email on exchagne and see if you get a bounce back
0
 
Don S.Connect With a Mentor Commented:
The other domains may in fact be using gmail servers to send mail.  It's possible that the incoming mail connection is being rejected immediately at your spam filter - possibly because of the sender being on an RBL or something like that.  The rejections may not make it back to the users for a while if ever.  Gmail can be a tough one to figure out once someone is on someone else's naughty list.
0
 
denver218Author Commented:
I called the ISP, and am waiting on a call back.  If I send a test email from gmail, I don't get any kind of kick back, nor is it even hitting my Astaro (email gateway).  Yes it is possible the other domains are using gmails servers.
0
 
Jessie Gill, CISSPTechnical ArchitectCommented:
ok that means, that Gmail is attempting to deliver the message, it will try a number of times before any NDR comes back. The fact that you indicated that email is not even reaching your gateway appliance, seems to indicate a communication problem from Gmail to you server. Most likely the ISP is having issues, or Gmail could have issues.
0
 
BahloulCommented:
if you have anti-spam or anti-virus could prevent some message.


Bahloul
0
 
denver218Author Commented:
So it was a bug in our email gateway (Sophos UTM 220).  They released bad firmware.  Everyone who uses a Sophos UTM, running 9-210 code were affected.  The SMTP logs didn't even show these emails were being rejected, which made it very difficult to troubleshoot, especially since we were not getting any NDR.  I called Sophos in desperation as I couldn't think what else it could be, and after a 2 hours of listening to their hold music, I finally got through to someone and they said it was a bug, and they were able to fix it.
0
 
denver218Author Commented:
Thanks for all your help.  As I stated in the last post, it was bad firmware in the Email Gateway.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.