6. Configuring Send Connector DNS Lookups
You can configure different settings for internal and external DNS lookups by configuring a Transport server's External DNS Lookups and Internal DNS Lookups properties. External DNS Lookup servers are used to resolve the IP addresses of servers outside your organization. Internal DNS Lookup servers are used to resolve IP addresses of servers inside the organization.
To configure DNS Lookup servers, complete these steps:
-
Start the Exchange Management Console. On an Edge Transport server,
select Edge Transport. On a Hub Transport server, expand the Server
Configuration node, and then select the Hub Transport node. -
In the details pane, right-click the server and then select Properties. -
On the External DNS Lookups tab, shown in Figure 2, specify how external lookups should be performed:
-
To use DNS settings from the server's network card or cards for
external lookups, select Use Network Card DNS Settings, and then choose
either All Available to use all configured settings or a specific
network card to use the configured settings of that card. -
To use a specific DNS server for external
lookups, click Use These DNS Servers. Then type the IP address of a DNS
server to use for external lookups, and then click Add. Repeat this
process to specify multiple servers.
-
On the Internal DNS Lookups tab, specify how internal lookups should be performed:
-
To use DNS settings
from the server's network card or cards for internal lookups, select
Use Network Card DNS Settings and then choose either All Available to
use all configured settings or a specific network card to use the
configured settings of that card. -
To use a specific DNS server for internal lookups, click Use These
DNS Servers. Then type the IP address of a DNS server to use for
internal lookups, and then click Add. Repeat this process to specify
multiple servers.
-
Click OK to save your settings.
7. Setting Send Connector Limits
Send connector limits determine how mail is delivered after a
connection has been established and the receiving computer has
acknowledged that it's ready to receive the data transfer. After a
connection has been established and the receiving computer has
acknowledged that it's ready to receive the data transfer, Exchange
Server attempts to deliver messages queued for delivery to the
computer. If a message can't be delivered on the first attempt,Exchange
Server tries to send the message again after a specified time. Exchange
Server keeps trying to send the message at the intervals you've
specified until the expiration time-out is reached. When the time limit
is reached, the message is returned to the sender with a nondelivery
report (NDR). The default expiration time-out is two days.
After multiple failed attempts to deliver a message, Exchange Server
generates a delay notification and queues it for delivery to the sender
of the message. Notification doesn't occur immediately after failure.
Instead, Exchange Server sends the delay notification message only
after the notification delay interval and then only if the message
hasn't already been delivered. The default delay notification is 4
hours.
With SMTP, you have much more control over outgoing connections than
you do over incoming connections. You can limit the number of
simultaneous connections and the number of connections per domain.
These limits set
the maximum number of simultaneous outbound connections. By default,
the maximum number of connections is 1,000 and the maximum number of
connections per domain is 20.
You can view or change the Send connector limits by completing the following steps:
-
Start the Exchange Management Console. On an Edge Transport server,
select Edge Transport. On a Hub Transport server, expand the Server
Configuration node, and then select the Hub Transport node. -
In the details pane, right-click the server and then select Properties. -
On the Limits tab, shown in Figure 3, use the following options for retrying unsuccessful outbound connections:
-
Outbound Connection Failure Retry Interval (Minutes)
Sets the retry interval for subsequent connection attempts to a remote
server where previous connections have failed. The default is 10
minutes. -
Transient Failure Retry Interval (Seconds)
Sets the interval at which the server immediately retries when it
encounters a connection failure with a remote server. The default is
300 seconds. -
Transient Failure Retry Attempts
Sets the maximum number of times that the server immediately retries
when it encounters a connection failure with a remote server. The
default is six. If you enter 0 as the number of retry attempts or the
maximum number of attempts has been reached, the server no longer
immediately retries a connection and instead waits according to the
outbound connection failure retry interval.
-
When messages that cannot be delivered reach the Maximum Time Since
Submission value, they expire, and Exchange Server generates a
nondelivery report. To set the expiration time-out for messages, enter
the desired message expiration value in the Maximum Time Since
Submission (Days) text box. The default expiration time-out for
messages is two days.
-
When messages are delayed longer than the allowed delay interval,
Exchange Server sends a delay notification to the sender. To set the
amount of time to wait before notifying senders of a delay, enter the
desired wait time in the Notify Sender When Message Is Delayed More
Than (Hours) text box. The default wait time is four hours. -
To remove outgoing connection limits, clear the Maximum Concurrent
Outbound Connections check box. To set an outgoing connection limit,
select the Maximum Concurrent Outbound Connections check box, and then
type the limit value. The default limit is 1,000 outbound connections. -
To remove outgoing connection limits per domain, clear the Maximum
Concurrent Outbound Connections Per Domain check box. To set an
outgoing connection limit per domain, select the Maximum Concurrent
Outbound Connections Per Domain check box, and then type the limit
value. The default limit is 20 outbound connections per domain. -
Click OK to save your settings.
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