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Blocking all SMTP requests, except from my smarthost!

FlemmingHougaard

Hi

Situation is as follows:

  • I use the UTM SMTP Proxy functionality in order to use the spamfilter, and attach DKIM-information on ongoing mails!
  • Due to a public address within a DHCP scope, and the fact I can't get my ISP to make an PTR-record, I have to use a smarthost (upstream & downstream) I've created in Azure with postfix.
  • The checkmark "Allow upstream/relay hosts only" is checked, but the SMTP server is still answering on requests - I will get the 550 Access denied (not in relay or upstream list).

What I need:

  • The possibility to create a firewall rule, that will block all incoming SMTP connections.
  • and then a firewall rule, that will allow delivery of mail from my smarthost!

How to do? Can't seem to get it working...

Best regards

Flemming



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Parents
  • Your smarthost uses the smtp proxy if you have set it up in that tab, so a firewall rule will not apply. Depends on your existing firewall rules, but yes you can and you would put it at the top of the firewall rule table.
    I think you should investigate the smtp proxy a bit more.

    ian

    XG115W - v20.0.2 MR-2 - Home

    XG on VM 8 - v21 GA

    If a post solves your question please use the 'Verify Answer' button.

Reply
  • Your smarthost uses the smtp proxy if you have set it up in that tab, so a firewall rule will not apply. Depends on your existing firewall rules, but yes you can and you would put it at the top of the firewall rule table.
    I think you should investigate the smtp proxy a bit more.

    ian

    XG115W - v20.0.2 MR-2 - Home

    XG on VM 8 - v21 GA

    If a post solves your question please use the 'Verify Answer' button.

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