07-15-2016
Thank you for your thoughts RudiC,
I can confirm that it is always the same sender because we force the sender name.
We have considered DNS, but the frequency seems too high to be mistakes so the mail won't deliver (besides we just need to get it into the queue) and if it was a general problem I wouldn't think we should get any processed really quickly. The nearest I have on DNS is that the mail is from application generating the mail is an active-active cluster and what appears in the log is the boot IP address sending mail in, not a DNS name. Perhaps it is trying to reverse lookup, but the time is not consistent so leads me away from that being the issue. DNS query timeout has not yet been adjusted as people are not keen to fiddle with it, but it's still an option if we can be fairly certain.
Kind regards,
Robin
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LEARN ABOUT CENTOS
ipa-dns-install
ipa-dns-install(1) IPA Manual Pages ipa-dns-install(1)
NAME
ipa-dns-install - Add DNS as a service to an IPA server
SYNOPSIS
ipa-dns-install [OPTION]...
DESCRIPTION
Adds DNS as an IPA-managed service. This requires that the IPA server is already installed and configured.
OPTIONS
-p DM_PASSWORD, --ds-password=DM_PASSWORD
The password to be used by the Directory Server for the Directory Manager user
-d, --debug
Enable debug logging when more verbose output is needed
--ip-address=IP_ADDRESS
The IP address of the IPA server. If not provided then this is determined based on the hostname of the server.
--forwarder=FORWARDER
A forwarder is a DNS server where queries for a specific non-resolvable address can be directed. To define multiple forwarders use
multiple instances of --forwarder
--no-forwarders
Do not add any DNS forwarders, send non-resolvable addresses to the DNS root servers.
--reverse-zone=REVERSE_ZONE
The reverse DNS zone to use
--no-reverse
Do not create new reverse DNS zone. If used on a replica and a reverse DNS zone already exists for the subnet, it will be used.
--zonemgr
The e-mail address of the DNS zone manager. Defaults to hostmaster@DOMAIN
-U, --unattended
An unattended installation that will never prompt for user input
EXIT STATUS
0 if the installation was successful
1 if an error occurred
IPA
Jun 28, 2012 ipa-dns-install(1)