简介
本文描述拒绝的消息并且重新启动由于在思科电子邮件安全工具(ESA)的大报头。
与"552 #5.3.4信息标题大小的信号反跳信息超过限制”
当主机设法发送与一个大报头时的邮件， ESA可能拒绝它。最终用户可能发现以下错误消息之一：
"552 #5.3.4 message header size exceeds limit"
"500 #5.5.1 command not recognized"
"421 Exceeded bad SMTP command limit"
在某些情况下，主机可能继续再试同一个消息。
有信息标题的一1000线路限制。当报头长度超出1000条线路时， ESA发送消息"552 #5.3.4信息标题大小超过限制”对发送的主机。
一些主机可能忽略此消息和继续发送数据。ESA解释此数据，当SMTP发出命令和回归， “500个#5.5.1为每条线路没认可的”命令。
在超过4坏SMTP命令限制以后， ESA然后返回消息， “421超过了坏SMTP命令限制”，并且切连接。
此设置在CLI可以只更改：
myesa.local> listenerconfig
Currently configured listeners:
1. listener_myesa.local (on Management, 192.168.0.199) SMTP TCP Port 25 Public
Choose the operation you want to perform:
- NEW - Create a new listener.
- EDIT - Modify a listener.
- DELETE - Remove a listener.
- SETUP - Change global settings.
[]> setup
Enter the global limit for concurrent connections to be allowed across
all listeners.
[50]>
Listener istener_myesa.local Policy $TRUSTED max concurrency value of 300
will be limited to 50 by this concurrency setting.
Enter the global limit for concurrent TLS connections to be allowed across
all listeners.
[100]>
Concurrent TLS connections value of 100 will be limited to 50 by the global
limit for concurrent connections.
Enter the maximum number of message header lines. 0 indicates no limit.
[1000]>
Enter the rate at which injection control counters are reset.
[1h]>
Enter the timeout for unsuccessful inbound connections.
[5m]>
Enter the maximum connection time for inbound connections.
[15m]>
What hostname should Received: headers be stamped with?
1. The hostname of the Virtual Gateway(tm) used for delivering the message
2. The hostname of the interface the message is received on
[2]>
The system will always add a Message-ID header to outgoing messages that don't
already have one. Would you like to do the same for incoming messages? (Not
recommended.) [N]>
By default connections with a HAT REJECT policy will be closed with a banner
message at the start of the SMTP conversation. Would you like to do the rejection
at the message recipient level instead for more
detailed logging of rejected mail? [N]>
如果其中任一更改或更新被做，请回到主CLI提示符并且运行进行保存和实现更改。
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