EZA5208E

mm/dd/yy hh:mm:ss DNS response was truncated
so a name cannot be resolved
Explanation
 SMTP received a response to a domain name server
(DNS) query. The response was truncated because it was too large to
fit in a UDP packet. SMTP supports only the UDP protocol for name
resolution. Because the DNS response was incomplete, it was discarded.
As a result, the mail messages remain on the resolver queues and will
be retried. This message will be generated only the first time the
situation is detected.
 In the message text: mm/dd/yy
The date (month/day/year) when the DNS response was received.
hh:mm:ss
The time (hours:minutes:seconds) when the DNS response was received.

System action
 SMTP continues.

Operator response
 None.

System programmer response
 Contact the administrators for the
DNS and inform them of the problem. If the problem can be resolved
at the DNS, SMTP will automatically recover because it will try the
DNS query again. The retry time of the DNS query depends on your SMTP
configuration setting. See the RESOLVERRETRYINT
statement in z/OS Communications Server: IP Configuration
Reference.
 If you are using the IPMAILERNAME
statement and the problem cannot be resolved at the DNS, you can switch
to using the IPMAILERADDRESS statement until the DNS is modified.
If you do switch to the address indicated by the IPMAILERADDRESS statement
and you want all the mail sent to that address, set the RESOLVERUSAGE
statement to NO. See the SMTP configuration statements IPMAILERNAME and IPMAILERADDRESS in z/OS Communications Server: IP Configuration
Reference.
 You can determine whether the problem
is resolved by entering the TSO command SMSG <SMTP_STARTED_TASK_NAME>
QUEUE. If the problem is resolved,  the number of mail messages on
the resolver queues will decrease.

User response
 Not applicable.

Problem determination
 If you are using multiple DNS servers,
you might need to determine which server returned this response. You
can dynamically activate resolver traces by entering the TSO command
SMSG <SMTP_STARTED_TASK_NAME> TRACE. Review the resolver traces
in the SMTP output file. Look for message EZA5526I, which contains
the DNS query number, to determine which DNS is issuing this response
and what name is being resolved.

Source
 z/OS® Communications
Server TCP/IP: SMTP

Module
 SMTPRES

Routing code
 2, 10

Descriptor code
 4

Automation
 This message is a candidate for automation. You
can use this message to alert you to a DNS problem.

Example
  SMTP output
file with resolver traces active:
 EZA5526I 02/03/11 13:25:08#   1 Truncation Bit set in Nameserver 
Response                                                         
EZA5208E 02/03/11 13:25:08 DNS response was truncated so 
a name cannot be resolved                                        

System console:                                                  
$HASP100 SMTP     ON STCINRDR                                    
IEF695I START SMTP     WITH JOBNAME SMTP     IS ASSIGNED TO USER 
IBMUSER, GROUP SYS1                                              
$HASP373 SMTP     STARTED                                        
IEF403I SMTP - STARTED - TIME=13.40.18                           
EZY1876I SMTP STACK FUNCTIONS STARTED WITH PARAMETER SMTP,PARM=, 
ERRFILE(SYSERR),NOSPIE/.                                         
EZA5208E 02/03/11 13:40:20 DNS response was truncated so 
a name cannot be resolved                                  