= s/qmail/SPF =
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現状では使える場面が少ない。
  使いたい場面で不都合がある。-- ToshinoriMaeno <<DateTime(2021-05-15T09:19:17+0900)>>

https://www.fehcom.de/sqmail/man/qmail-smtpd.html

SPF検査はspamを拒否するためのものではなく、正常なメールを受信するためのものです。
  使い方が問題です。-- ToshinoriMaeno <<DateTime(2021-05-10T09:34:55+0900)>>

ttps://www.saout.de/misc/spf/ を組み込んでいる。

[[/spfquery]] の動作が変だ。-- ToshinoriMaeno <<DateTime(2021-05-09T11:08:20+0900)>>

{{{
spfbehavior
    Use this to turn on SPF checking. The default value is 0 (off).
    You can specify a value between 0 and 6:

        0: Never do SPF lookups, don't create Received-SPF headers
        1: Only create Received-SPF headers, never block
        2: Use temporary errors when you have DNS lookup problems
        3: Reject mails when SPF resolves to fail (deny)
        4: Reject mails when SPF resolves to softfail
        5: Reject mails when SPF resolves to neutral
        6: Reject mails when SPF does not resolve to pass

    Values bigger than 3 are strongly discouraged, you probably want to go with 2 or 3. 

Important: This setting can be overridden using the environment variable SPFBEHAVIOR,
e.g. from tcpserver rules.
    Note: If RELAYCLIENT is set, SPF checks won't run at all.
    (This also includes SMTP-AUTH and similar patches) 

}}}