How to use elmah email error filtring

See more:

C#

ASP.NET

elmah

I don't want to receive emails about

"The wait operation timed out"

error
what is wrong in my code? because I still getting emails about this error

What I have tried:

my config file

<?xml version="1.0"?>

<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>
<configSections>
    <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>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <modules>
      <add name="Elmah.ErrorLog" type="Elmah.ErrorLogModule, Elmah" preCondition="managedHandler" />
    <add name="Elmah.ErrorMail" type="Elmah.ErrorMailModule" preCondition="managedHandler" />
 </modules>
    <handlers>
      <add name="Elmah" path="elmah.axd" verb="POST,GET,HEAD" type="Elmah.ErrorLogPageFactory, Elmah" preCondition="integratedMode" />
    </handlers>
  </system.webServer>
  
  
  
  <elmah>
    <security allowRemoteAccess="0" />

  
    <errorLog type="Elmah.XmlFileErrorLog, Elmah" logPath="~/SiteData/ErrorLog" />
 
 <errorMail from="xxx"
  to="xxx"
  subject="Error"
  async="true"
  smtpPort="26"
           smtpServer="xxx"
           userName="xxx"
           password="xxx"> 
   </errorMail>
 </elmah>
  
  <location path="elmah.axd">
    <system.web>
      <authorization>
        <allow roles="Admin" />
        <deny users="*" />
      </authorization>
    </system.web>
  </location>
 
  <system.web>
    <compilation debug="true" strict="false" explicit="true" targetFramework="4.0" />
    
    <httpRuntime maxRequestLength="20480" executionTimeout="1800"/>
<httpHandlers>
      <add verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" />
    </httpHandlers>

    <httpModules>
      <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah"/>
<add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah"/>
  </httpModules>  
</system.web>
  
  <appSettings>
    <add key="aspnet:MaxHttpCollectionKeys" value="5000"></add>
  </appSettings>

</configuration>

code in Global.asax

void ErrorMail_Filtering(object sender, ExceptionFilterEventArgs e)
        {
            if (e.Exception.Message.Contains("The wait operation timed out"))
                e.Dismiss();
        }