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Old 11-20-2017, 09:36 AM   #1
lan_dre
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Emails sent to my domain from specific domain are delivered to some other IP


Hi there I'm new to this forum and I've just set up a new box with Postfix&Dovecot running on Ubuntu 16.04.
I can send and receive emails except for one domain and the case is as follows:

I can send emails to domain x.com but cannot receive emails from this domain.
I check all possible blocks or firewall rules that may prevent reception of emails from this domain without any success.
This domain relay their messages through Symantec Security and on looking further into the matter Symantec first said there was a DNS problem and fixed it. So I received only 1 email from this domain and never received again.
On more followup they ended saying the emails were being delivered after a 7th attempt. The issue here is that the IP address those emails were being delivered to is not my domain IP, which they showed me in a screenshot.

I'm stuck, anyone with some useful response!
 
Old 11-20-2017, 07:57 PM   #2
frankbell
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If you can get them to do you, you might ask the folks sending the emails to do a traceroute (tracert on Windows, I think) to your public ip address.
 
Old 11-21-2017, 04:37 AM   #3
TenTenths
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An MX lookup done on their mail server(s) may be more meaningful.
 
Old 11-21-2017, 09:50 AM   #4
lan_dre
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Hi guys, thanks for the responses. I requested the sender to perform the suggested actions still waiting for their response. They are a banking institution and so access to the network tools are very limited.
 
Old 11-21-2017, 01:49 PM   #5
scasey
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My bank's routine emails look like spam...I had to whitelist them. Do you have any spam filtering on your new installation? Spamassassin maybe?
In addition to what TenTenths said, I'd add an MX lookup on your mailserver at their DNS server may also shed some light. Do you know how to do that?
Very strange that the email is being delivered to some IP address that's not yours. Do
Code:
whois <IP address>
or
Code:
dig -x <IP address>
to find out to whom it belongs...I suspect (guessing) it's their IP and they're showing you the delivery of a BOUNCE from your server.
 
  


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