Mitigation: Do not use the `spf` condition in your ACL
Subsystem: spf
Remark: It is debatable if this should be filed against
- libspf2.
+ libspf2. There are hints (simon, #Exim IRC) that this
+ is related to
+ https://github.com/shevek/libspf2/pull/44
ZDI-23-1473 | ZDI-CAN-17643 | CVE-2023-42219 | Exim Bug 3033
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