I've also hit this issue.
- Bug#946829: sa-exim: After upgrade SA: GREYLIST_ISWHI... Marco Gaiarin
- Bug#946829: Added upstream. Marco Gaiarin
- Bug#946829: Added upstream. Logan Gunthorpe
- Bug#946829: Patch Henrik Krohns
- Bug#946829: CVE-2019-19920 Salvatore Bonaccorso
- Bug#946829: Patch works! Marco Gaiarin
