问题：
ESA能否将SMTP流量发送到除25以外的其他端口号？
端口25是标准SMTP端口邮件交换服务器，用于侦听传入的电子邮件。可以将ESA配置为通过备用端口将邮件传送到特定主机。CLI中的smtproutes命令是配置此功能的最简单方法：
mail3.example.com> smtproutes
There are no routes configured.
Choose the operation you want to perform:
- NEW - Create a new route.
- IMPORT - Import new routes from a file.
[]> new
Enter the hostname for which you want to set up a permanent route.
Partial hostnames such as ".example.com" are allowed.
Use "ALL" for the default route.
[]> testexchange.example.com
Enter the destination hosts, separated by commas, which you want mail for
testexchange.ironport.com to be delivered.
Enter /dev/null by itself if you wish to discard the mail.
[]> exchange.example.com:1025
Mapping for testexchange.ironport.com to exchange.example.com:1025 created.
There are currently 1 routes configured.
Choose the operation you want to perform:
- NEW - Create a new route.
- DELETE - Remove a route.
- PRINT - Display all routes.
- IMPORT - Import new routes from a file.
- EXPORT - Export all routes to a file.
- CLEAR - Remove all routes.
[]>
> commit
Please enter some comments describing your changes:
[]> testing the new exchange server on an alternate port
Changes committed: Mon Mar 28 14:20:06 2005 PST
mail3.example.com>
在这种情况下，系统配置为通过端口1025将有关testexchange.example.com的邮件发送到exchange.example.com。
您还可以通过GUI、网络(Network)->SMTP路由(SMTP Route)->添加SMTP路由(Add SMTP Route)，并使用所需端口填写域和目标主机。完成后，您必须提交并确认更改。
要配置ESA以使用设备GUI通过备用端口将邮件传送到特定主机，请选择Network > IP Interface，并修改IP接口的设置。
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