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Cisco IronPort AsyncOS 7.5 for Email Daily Management Guide
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Chapter 9      Testing and Troubleshooting
Troubleshooting Delivery
Troubleshooting Delivery
If you suspect problems with delivering email from the appliance, try the 
following strategies:
Determine if the problem is domain-specific.
Use the 
tophosts
command to get immediate information about the email 
queue and determine if a particular recipient domain has delivery problems. 
Are there problem domains returned when you sort by “Active Recipients?” 
When you sort by Connections Out, does any one domain reach the maximum 
connections specified for a listener? The default maximum number of 
connections for a listener is 600. The default maximum system-wide number 
of connections if 10,000 (set by the 
deliveryconfig
command). You can 
examine the maximum number of connections for a listener using the 
command:
listenerconfig
-> 
edit
-> injector_number -> 
limits
Are the connections for a listener further limited by the 
destconfig
command 
(either by system maximum or by Virtual Gateway addresses)? Use this 
command to examine the 
destconfig
connection limits: 
destconfig
-> 
list
Use the 
hoststatus
command. 
“Drill-down” using the 
hoststatus
command on the top domains listed from 
the results listed by the 
tophosts
command. 
Is the host available and accepting connections? 
Are there problems with one specific MX record mail server for the given 
host? 
The 
hoststatus
command reports the last “5XX” status code and description 
returned by the host if there is a 5XX error (Permanent Negative Completion 
reply) for the specified host. If the last outgoing TLS connection to the host 
failed, the 
hoststatus
command displays the reason why it failed.
Configure and/or examine the domain debug, bounce, and text mail logs to 
check if the recipient host is available.
Domain debug logs record the client and server communication during an 
SMTP conversation between the appliance and a specified recipient host. 
This log file type can be used to debug issues with specific recipient hosts. 
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Chapter 9      Testing and Troubleshooting
Troubleshooting Delivery
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For more information, see Using IronPort Domain Debug Logs, page 5-33. 
Bounce logs record all information pertaining to each bounced recipient.
For more information, see Using IronPort Bounce Logs, page 5-28. 
Text mail logs contain details of email receiving, email delivery and bounces. 
Status information is also written to the mail log every minute. These logs are 
a useful source of information to understand delivery of specific messages 
and to analyze system performance.
For more information, see Using IronPort Text Mail Logs, page 5-14. 
Use the 
telnet
command to connect from the appliance to the problem 
domain:
mail3.example.com> telnet
Please select which interface you want to telnet from.
1. Auto
2. Management (192.168.42.42/24: mail3.example.com)
3. PrivateNet (192.168.1.1/24: mail3.example.com)
4. PublicNet (192.168.2.1/24: mail3.example.com)
[1]> 1
Enter the remote hostname or IP.
[]> problemdomain.net
Enter the remote port.
[25]> 25
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Chapter 9      Testing and Troubleshooting
Troubleshooting Delivery
You can use the 
tlsverify
command to establish an outbound TLS 
connection on demand and debug any TLS connection issues concerning a 
destination domain. To create the connection, specify the domain to verify 
against and the destination host. AsyncOS checks the TLS connection based 
on the Required (Verify) TLS setting.
mail3.example.com> tlsverify
Enter the TLS domain to verify against:
[]> example.com
Enter the destination host to connect to.  Append the port 
(example.com:26) if you are not connecting on port 25:
[example.com]> mxe.example.com:25
Connecting to 1.1.1.1 on port 25.
Connected to 1.1.1.1 from interface 10.10.10.10.
Checking TLS connection.
TLS connection established: protocol TLSv1, cipher RC4-SHA.
Verifying peer certificate.
Verifying certificate common name mxe.example.com.
TLS certificate match mxe.example.com
TLS certificate verified.
TLS connection to 1.1.1.1 succeeded.
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Chapter 9      Testing and Troubleshooting
Troubleshooting Performance
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Troubleshooting Performance
If you suspect that there are there are performance problems with the appliance, 
utilize the following strategies:
Use the 
rate
and 
hostrate
commands to check the current system activity. 
The 
rate
command returns real-time monitoring information about email 
operations. For more information, see Displaying Real-time Activity, 
page 6-26
The 
hostrate
command returns real-time monitoring information for a 
specific host. 
Use the 
status
command to cross-check the historical rates to check for 
degradation.
Use the 
status detail
command to check the RAM utilization. 
You can use the 
status detail
command to quickly see the system’s RAM, 
CPU, and Disk I/O utilization.
Note
RAM utilization should always be less than 75%. If RAM utilization exceeds 
75%, then, the appliance will enter “resource conservation mode;” it initiates a 
“back-off” algorithm to prevent over-subscription of resources and sends out the 
following email alert:
TLS successfully connected to mxe.example.com.
TLS verification completed.
This system (hostname: hostname) has entered a 'resource conservation' 
mode in order to prevent the rapid depletion of critical system 
resources.
RAM utilization for this system has exceeded the resource conservation 
threshold of 75%. The allowed injection rate for this system will be 
gradually decreased as RAM utilization approaches 85%.
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Chapter 9      Testing and Troubleshooting
Troubleshooting Performance
This situation occurs only with an aggressive injection with poor 
deliverability facilities. If you encounter RAM utilization exceeding 75%, 
check the number of messages in the queue and see if a particular domain is 
down or unavailable for delivery (via the 
hoststatus
or 
hostrate
commands). Also check the status of the system and ensure that delivery is 
not suspended. If after stopping the injection you continue to experience a 
high RAM utilization, contact Cisco IronPort Customer Support. See Cisco 
IronPort Customer Support, page 1-7.
Is the problem specific to one domain? 
Use the 
tophosts
command to get immediate information about the email 
queue and determine if a particular recipient domain has delivery problems. 
Check the size of the queue. You can delete, bounce, suspend, or redirect 
messages in the email queue to manage its size, or to deal with recipients to 
a specific, problematic domain. For more information, see Managing the 
Email Queue, page 6-34. Use these commands: 
deleterecipients
bouncerecipients
redirectrecipients
suspenddel
resumedel
suspendlistener
resumelistener
Use the 
tophosts
command to check the number of soft and hard bounces. 
Sort by “Soft Bounced Events” (option 
4
) or “Hard Bounced Recipients” 
(option 
5
). If the performance for a particular domain is problematic, use the 
commands above to manage the delivery to that domain. 
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Chapter 9      Testing and Troubleshooting
Troubleshooting Performance
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IN-1
Cisco IronPort AsyncOS 7.5 for Email Daily Management Guide
OL-25138-01
INDEX
A
accessing
2-3
access privileges for custom user roles
8-39
Account Privileges page
8-38
Anti-Spam Archive Logs
5-5
Anti-spam logs
5-5
Anti-Virus Archive Logs
5-5
Anti-Virus Logs
5-5
archivemessage
command
6-51
archiving reports
2-65
B
blackhole listener
9-23
Bounce Logs
5-3
bouncerecipients
command
6-37
bouncing recipients
all
6-39
by Envelope From
6-39
by hostname
6-39
C
Change Password link
8-26
changing your password
8-26
clean message
2-10
CLI Audit Logs
5-4
Cloud user types
8-37
community string
6-55
configuration file
8-50
CLI
8-57
GUI
8-52
XML
8-51
connectivity issues, troubleshooting
9-28
counters
6-1, 6-2
CPU usage
6-5
CSV data
2-63
custom user roles
8-37
D
daily magnitude
2-18
Default Action
delete
4-6
for quarantine
4-6
Index
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OL-25138-01
release
4-7
delegated administration
8-37
delete all messages in the IronPort Spam 
quarantine
4-53
deleterecipients
command
6-34
delivernow
command
6-47
Delivery Connection ID (DCID)
6-4
Delivery Logs
5-3
delivery queue
6-34
delivery queue, monitoring
6-24
Delivery Status Details page
2-30
Delivery Status page
2-29
diagnostic -> network -> arpshow
command
9-31
diagnostic -> network -> flush
command
9-31
diagnostic -> network -> smtpping
command
9-33
DNS
A Record
9-36
cache
9-36
double lookup
2-15
PTR record
9-36
testing
9-33
DNS cache
6-32
DNS lookup
6-32
dnsstatus
command
6-32
Domain Debug Logs
5-3
domains
2-19
double-DNS verified
2-16
DTD (document type definition)
8-54
E
Early Expiration
for quarantine
4-6
email
clean message
2-10
Email Security Monitor
2-1, 2-3
automated reporting
2-63
external domains received listing
2-15
Items Displayed menu
2-16
mail trend graph
2-8
summary table
2-8
Time Range menu
2-8
Envelope Recipient
3-5
Envelope Sender
3-5
event tracking
3-6
Currently in Outbreak Quarantine
3-6
Delivered
3-6
DLP Violations
3-6
Hard Bounced
3-6
Quarantined as Spam
3-6
Soft Bounced
3-6
Spam Positive
3-6
Suspect Spam
3-6
Virus Positive
3-6
external authentication
enabling LDAP
8-33
enabling RADIUS
8-35
IN-3
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OL-25138-01
Index
F
feature key
8-15
feature keys
adding (GUI) manually
8-17
findevent
6-52
firewall permissions
9-36
forward DNS lookup
6-30
FTP Push
5-10
FTP Server Logs
5-4
G
gauges
6-1, 6-5
global counters
6-33
graph
2-5
graphical user interface
see GUI
graphs
7-6
GUI
enabling
7-1
overview
7-1
H
hostrate
command
6-27
hoststatus
command
2-30, 6-21
HTTP
GUI
7-1
HTTP authentication
2-64
HTTP Logs
5-4
HTTPS
GUI
7-1
I
IMAP authentication
4-35
Incoming Mail Reporting page
2-11
Injection Connection ID (ICID)
6-4
Injection Debug Logs
5-4
international character sets
3-6
invalid recipient
2-9
IP addresses
2-19
IP address profile pages
2-17
IPMI
6-56
IronPort Spam Quarantine
behavior when full
4-32
configuring
4-26
default language
4-32
defined
4-2
deleting all messages
4-28, 4-53
disabling
4-27
end user access without 
authentication
4-35
end user authentication
4-35
IMAP/POP authentication
4-45
LDAP authentication
4-44
message details
4-52
message variables
4-37
Index
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Cisco IronPort AsyncOS 7.5 for Email Daily Management Guide
OL-25138-01
notification
4-3
priority
4-26
receiving multiple notifications
4-47
released messages and email pipeline
4-52
testing notifications
4-46
IronPort Text Mail Logs
5-2
K
keys
8-15
L
language
specifying a default language for IronPort 
Spam Quarantine
4-32
last
command
8-27
LDAP
external authentication
8-33
LDAP Debug Logs
5-4
load
6-5
loadconfig
command
8-60
log file type
5-2
logging
overview
5-1
logheaders
command
5-63
logs
Anti-Spam Archive
5-5
Anti-Virus
5-5
Anti-Virus Archive
5-5
Bounce Logs
5-3
CLI Audit Logs
5-4
comparison
5-7
Configuration History Logs
5-56
definition
5-2
Delivery Logs
5-3
extensions in filenames
5-66
format
5-2
FTP Server Logs
5-4
global attributes
5-61
HTTP Logs
5-4
Injection Debug Logs
5-4
IronPort Text Mail Logs
5-2
LDAP Debug Logs
5-4
levels
5-58
log subscription defined
5-2
message headers in
5-63
NTP Logs
5-4
qmail Format Delivery Logs
5-2
rolling over
5-11
Scanning
5-5
SCP Push
5-10
Status Logs
5-3
subscriptions
5-11
syslog push
5-10
troubleshooting with
9-38
log subscription
5-2
log subscriptions
5-11
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