PI41480: SMTP NOT RETRYING UNRESOLVED MAIL RECIPIENT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When the z/VM SMTP server is processing incoming mail and is
  not able to resolve the hostname of a mail recipient, it is
  supposed to queue up the request that it sends to the resolver
  on the resolver retry queue and keep trying every 20 minutes
  (the default retry interval) for three days (the default retry
  age) before giving up and sending error mail back to the mail
  sender.  However, in some cases, the SMTP server immediately
  attempts to send back error mail after a failed attempt to
  resolve the recipient host name.  If the resolver function is
  not working due to network failure, then the attempt to send
  back the error mail may fail as well.  The following messages
  may occur in this scenario:
  .
    #257 Rcpt to unknown host: recipient.ibm.com
    DTCSMT1311I Generating Note 00380285 as Error Notification
    DTCSMT1313I Unable to deliver Note: 00380284 to <sender.com>
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the z/VM SMTP server            *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  When the z/VM SMTP server is processing incoming mail and is
  not able to resolve the hostname of a mail recipient, it is
  supposed to queue up the request that it sends to the resolver
  on the resolver retry queue and keep trying every 20 minutes
  (the default retry interval) for three days (the default retry
  age) before giving up and sending error mail back to the mail
  sender.  However, in some cases, the SMTP server immediately
  attempts to send back error mail after a failed attempt to
  resolve the recipient host name.  If the resolver function is
  not working due to network failure, then the attempt to send
  back the error mail may fail as well.  The following messages
  may occur in this scenario:
  .
    #257 Rcpt to unknown host: recipient.ibm.com
    DTCSMT1311I Generating Note 00380285 as Error Notification
    DTCSMT1313I Unable to deliver Note: 00380284 to <sender.com>
  

Problem conclusion

• Updated the SendRQR routine in SMTPRES PASCAL in order to have
  mail that is intended for a recipient whose hostname cannot be
  resolved placed on the resolver retry queue.  The mail will now
  be retried every resolver retry interval for the resolver retry
  age prior to being sent back to the sender as error mail.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI29826 UI29827 UI29828

Modules/Macros

• SMTPRES
  

Fix information

• Fixed component name

  TCP/IP V2 FOR V

• Fixed component ID

  5735FAL00

Applicable component levels

• R540 PSY UI29826

     UP15/07/29 I 1000

• R620 PSY UI29827

     UP15/07/29 P 1501

• R630 PSY UI36140

     UP16/03/15 P 1701

Fix is available

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