https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7770

            Bug ID: 7770
           Summary: KHOP_HELO_FCRDNS falsely triggers if HELO is
                    uppercase.
           Product: Spamassassin
           Version: 3.4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Rules
          Assignee: dev@spamassassin.apache.org
          Reporter: m...@psfc.mit.edu
  Target Milestone: Undefined

The rule is triggered if HELO is upper case:

X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on psfcmail.mit.edu
X-Spam-Level: *
X-Spam-Status: No, score=1.4 required=5.0 tests=BODY_URI_ONLY,EMPTY_MESS,
        KHOP_HELO_FCRDNS autolearn=disabled version=3.4.0
Received: from w92exedge4.exchange.mit.edu (W92EXEDGE4.EXCHANGE.MIT.EDU
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        by outgoing-exchange-7.mit.edu (8.14.7/8.12.4) with ESMTP id
xA7GffnY019
407
        for <x...@psfc.mit.edu>; Thu, 7 Nov 2019 11:41:44 -0500

But if the HELO is lowercase, it doesn't trigger.

X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on psfcmail.mit.edu
X-Spam-Level: *
X-Spam-Status: No, score=1.0 required=5.0 tests=BODY_URI_ONLY,EMPTY_MESS
        autolearn=disabled version=3.4.0
Received: from w92exedge4.exchange.mit.edu (w92exedge4.exchange.mit.edu
[18.7.73
.16])
        by outgoing-exchange-7.mit.edu (8.14.7/8.12.4) with ESMTP id
xA7GffnY019
407
        for <x...@psfc.mit.edu>; Thu, 7 Nov 2019 11:41:44 -0500

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