asp.net – 无法为Elmah配置邮件

<?xml version="1.0"?>
<configuration>
    <configSections>
        <!--ELMAH-->
        <sectionGroup name="elmah">
            <section name="security" requirePermission="false" type="Elmah.SecuritySectionHandler,Elmah"/>
            <section name="errorLog" requirePermission="false" type="Elmah.ErrorLogSectionHandler,Elmah"/>
            <section name="errorMail" requirePermission="false" type="Elmah.ErrorMailSectionHandler,Elmah"/>
            <section name="errorFilter" requirePermission="false" type="Elmah.ErrorFilterSectionHandler,Elmah"/>
        </sectionGroup>
    </configSections>
    <elmah>
        <security allowRemoteAccess="1"/>   
        <!-- set the smtpPort attribute to "0". Doing so will cause ELMAH to use the port defined per the <system.net> settings -->
        <errorMail from="example1@gmail.com" to="example2@gmail.com" subject="ERROR(test):" async="false" smtpPort="0" useSsl="true" />
    </elmah>
    <!--System.net Mail setup-->
    <system.net>
        <mailSettings>
            <smtp deliveryMethod="network">
                <network host="smtp.gmail.com" port="587" userName="example1@gmail.com" password="..." />
            </smtp>
        </mailSettings>
    </system.net>
    <appSettings>
    ...
 </appSettings>
    <connectionStrings>
        ...     
    </connectionStrings>
    <system.web>
        <compilation debug="true">
            <assemblies>
                ...
        </compilation>
        <customErrors mode="Off"/>
        ...
        <httpHandlers>
            ...
            <!--ELMAH-->
            <add verb="POST,GET,HEAD" path="MyErrorPage/elmah.axd" type="Elmah.ErrorLogPageFactory,Elmah"/>            
        </httpHandlers>
        <httpModules>
            ...
            <!-- ELMAH: Logging module -->
            <add name="ErrorMail" type="Elmah.ErrorMailModule,Elmah"/>
            <!-- <add name="ErrorLog" type="Elmah.ErrorLogModule,Elmah"/> -->
            <!--<add name="ErrorFilter" type="Elmah.ErrorFilterModule,Elmah"/>-->
        </httpModules>
        <httpRuntime maxRequestLength="458292"/>
        <authentication mode="Forms">
            ...
        </authentication>
    ...
    </system.web>
    <location path="MyErrorPage.aspx">
        <system.web>
            <authorization>
                <allow users="?"/>
            </authorization>
        </system.web>
    </location> 
    <!-- 
        The system.webServer section is required for running ASP.NET AJAX under Internet
        Information Services 7.0.  It is not necessary for previous version of IIS.
    -->
    <system.webServer>
        <validation validateIntegratedModeConfiguration="false"/>
        <modules runAllManagedModulesForAllRequests="true">
            ...
            <!-- ELMAH-->
            <add name="ErrorLog" type="Elmah.ErrorLogModule,Elmah"/> 
            <add name="ErrorMail" type="Elmah.ErrorMailModule,Elmah"/>
            <add name="ErrorFilter" type="Elmah.ErrorFilterModule,Elmah"/>
        </modules>
        <handlers>
            ...
            <!--ELMAH-->
            <add name="Elmah" verb="POST,Elmah"/>           
        </handlers>
    </system.webServer>
    <runtime>       
        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
            ...
        </assemblyBinding>
    </runtime>
    <location path="MyErrorPage/elmah.axd">
        <system.web>
      <authorization>
        <deny users="?"/>
        <allow users="?"/>
      </authorization>
        </system.web>
    </location>  
</configuration>