XFOR: Smtpsvc Queue Processing Is Slow When DNS Lookup Fails
Article ID: 168108
Article Last Modified on 11/7/2003
APPLIES TO
- Microsoft Commercial Internet System 1.0 Service Pack 2
This article was previously published under Q168108
SYMPTOMS
This article applies to Microsoft Mail Server. The Internet Mail Server may
process mail slowly resulting in a backup of mail in the mail queue as well
as in the pickup directories. The queue directory will contain a large
number of .rtr files which indicates that multiple Domain Name Service
(DNS) retries have occurred.
CAUSE
Excessive DNS query failures cause mail processing to perform slowly
because IMS continually attempts to resolve the names against the DNS. The
DNS lookup attempts use a critical section to ensure mutual exclusion when
running the DNS lookup code. This causes all other queue processing that
requires DNS resolution to stop until the current DNS lookup is complete.
RESOLUTION
Smtpsvc.dll was modified to resolve contributing issues with the handling
of DNS MX lookups, and the handling of DNS lookup retries.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Commercial
Internet System version 1.0. This problem has been corrected in the latest
U.S. Service Pack for Microsoft Commercial Internet System version 1.0. For
information on obtaining the Service Pack, query on the following article
in the Microsoft Knowledge Base:
183062
MCIS 1.0 Service Packs 1 and 2 Information
Additional query words: sp2 ims mcis1sp2fix
Keywords: kbbug kbfix KB168108