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Forbidding users from using another smtp server

Discussion in 'E-mail Discussion' started by chanklish, Aug 17, 2017.

  1. chanklish

    chanklish Active Member

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    hello
    i have several accounts in my whm that all uses my server as email server
    it is working normally without any issues with spf,dkim and dmarc set .
    lately i found several users using other smtp server in their outlook , i enabled smtp restrictions but nothing happened ..they kept sending emails ( and receiving errors from the dmarc in return)
    is there any way where i can force them to use my smtp by cpanel ?
    thank you
     
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    Could you provide more information about how they are configuring their Outlook client? For instance, are they sending email using another email host?

    Thank you.
     
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  3. chanklish

    chanklish Active Member

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    hello Michael , we are using pop on microsoft outlook , smtp and pop server are my vps's hostname.
    they are using other smtp service like smtp2go per example and changing the smtp server + username in their outlook account page
     
  4. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    You can't prevent them from using a third-party server for SMTP in their email client settings. However, you could prevent the SMTP2GO IP addresses from authenticating with the cPanel server in your firewall or via the "Blacklisted SMTP IP addresses" option in "WHM >> Exim Configuration Manager >> Basic Editor".

    Thank you.
     
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  5. chanklish

    chanklish Active Member

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    is there a way to add all IP addresses to the blcklisted smtp ip except my own ? like XXX.XXX.XXX.XXX!
     
  6. cPanelMichael

    cPanelMichael Forums Analyst
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    Could you provide more details about which connections you'd like to block? Is this for all incoming SMTP connections to the cPanel server?

    Thank you.
     
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