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don't allow email from your own domain

Justin Beeler

I'm getting email coming in from my domain to my domain from the "untrusted" side and I'm not quite sure how to block it with the SMTP settings.  I've searched and I'm not seeing a real sure fire way to do this.  With other firewalls I've seen this blocked by default.  Still fairly new to UTM.  Any help is greatly appreciated.

 

Justin Beeler



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    Hi Justin,

    as  stated, SPF is one possibility. Consider that you need to add all ip addresses of systems, that are sending mails with your domain name.

     

    But a simple solution for you could be to add your email domain like "*@yourdomain.com" to the blacklist pattern in UTM Antispam section. I have also done this for our domain, exactly for these type of mails originating from external. But you need to think about this, if there are any side effects. So you need to consider, if you have any valid mails with your domain coming from external. For example sometimes newsletters come with your own domain or different servers. I think the problem is, that you cannot create a blacklist exception in utm.

     

    Regards,

    Sebastian

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    Hi Justin,

    as  stated, SPF is one possibility. Consider that you need to add all ip addresses of systems, that are sending mails with your domain name.

     

    But a simple solution for you could be to add your email domain like "*@yourdomain.com" to the blacklist pattern in UTM Antispam section. I have also done this for our domain, exactly for these type of mails originating from external. But you need to think about this, if there are any side effects. So you need to consider, if you have any valid mails with your domain coming from external. For example sometimes newsletters come with your own domain or different servers. I think the problem is, that you cannot create a blacklist exception in utm.

     

    Regards,

    Sebastian

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