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Block E-mail sender not created in server

Discussion in 'E-mail Discussion' started by lucascaleto, May 20, 2009.

  1. lucascaleto

    lucascaleto Member

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    Hi, how can i prevent to a user try using my smtp to send mail.
    using different sender like:
    juliana@hotmail.com

    i think this will prevent some atacks when the clients have virus in the computer and virus using smtp of my server .
     
    #1 lucascaleto, May 20, 2009
  2. thewebhosting

    thewebhosting Well-Known Member

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    Only allow SMTP authenticated scripts to run on your server. function like php mail() does not require SMTP authentication.

    You can disable this function by preventing nobody user to send emails from WHM. Go to WHM -> Tweak settings -> check the checkbox "Prevent the user "nobody" from sending out mail to remote addresses"
     
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    #2 thewebhosting, May 20, 2009
  3. lucascaleto

    lucascaleto Member

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    And to prevent smtp users dont exists
    for example. my client have the username and password pop/smtp account get from a virus


    and the virus try send mail using ther username and password but with another sender (the correct smtp/pop autentication data) , virus just change the from header. and dont use scripts
    how can i prevent this ?
     
    #3 lucascaleto, May 21, 2009
  4. eth00

    eth00 Well-Known Member
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    Not sure you really can do that. The best option is to limit the max per hour and enable all of the extended logging. When they do start to send out you can easily track it down.
     
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    #4 eth00, May 21, 2009
  5. thewebhosting

    thewebhosting Well-Known Member

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    You can set the maximum emails per hour limit from WHM -> Tweak settings.
     
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    #5 thewebhosting, May 21, 2009
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