Cisco Cisco Email Security Appliance X1070 Fehlerbehebungsanleitung
Sender Verification, "envelope Senders whose
domain does not exist"
domain does not exist"
Document ID: 118556
Contributed by Cisco TAC Engineers.
Oct 13, 2014
Contents
Introduction
Description
Description
Introduction
In the mail logs, you might see the error for "envelope sender domain does not exist."
Description
The Cisco Email Security Appliance (ESA) makes an MX record query for the domain of the sender address.
It then performs an A record lookup on the MX records. If, for any of these queries, the DNS server returns
'NXDOMAIN' (there is no record for this domain), the ESA treats that domain as non−existent. This falls into
the category of "envelope senders whose domain does not exist." NXDOMAIN can mean that the root name
servers are not providing any authoritative name servers for this domain.
It then performs an A record lookup on the MX records. If, for any of these queries, the DNS server returns
'NXDOMAIN' (there is no record for this domain), the ESA treats that domain as non−existent. This falls into
the category of "envelope senders whose domain does not exist." NXDOMAIN can mean that the root name
servers are not providing any authoritative name servers for this domain.
Example:
Mon Nov 20 10:50:05 2006 Info: New SMTP ICID 1605269 interface InternalNet
(10.101.150.43) address 192.168.23.36 reverse DNS host small−mail.example.com
verified yes
Mon Nov 20 10:50:05 2006 Info: ICID 1605269 ACCEPT SG UNKNOWNLIST match
sbrs[0.0:10.0] SBRS 3.5
Mon Nov 20 10:50:05 2006 Info: ICID 1605269 Address: < jane@example.com> sender
rejected, envelope sender domain does not exist
Mon Nov 20 10:50:05 2006 Info: ICID 1605269 lost
Mon Nov 20 10:50:05 2006 Info: ICID 1605269 close
Updated: Oct 13, 2014
Document ID: 118556