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CSchulz
Asked: 2014-06-06 10:28:15 +0800 CST

Use greylisting only if SPF fails

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I have noticed that more and more people using the DNS based SPF records and I want to enhance my spam filter.
I am using SPF and greylisting after each other and my idea would be to use only greylisting if SPF fails or similar.

I have searched the internet for a soluation, but it seems that most people only wish a new feature for example for sqlgrey doing it, which is being declined by the author, because it isn't the main task of a greylisting tool.

Has anyone such filter chain running and can help me out?
Thanks in advance.

postfix

1 Answers

  1. Best Answer

    Your idea was implemented in milter-greylist, another milter to support greylisting. In their features page, it says

    Starting with version 1.1.3, milter-greylist is able to use libspf_alt to check SPF records. SPF records are DNS objects that tell the whole Internet which server(s) can legally send e-mail from a domain.

    Using SPF records, milter-greylist will avoid greylisting any mail that comes from an SPF-compliant server. This feature is optionnal and requires libspf_alt

    Starting with 1.1.10, libspf (James Couzens's version) is also supported. libpsf2 is supported starting with version 1.7.2.

    The feature auto whitelisting for spf-compliant-server is enabled by default. You can disabled it by adding nospf in its configuration.

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