… resubmits the BlueMail app in a format compatible with the latest version of MacOS Catalina, the BlueMail app can be approved—assuming it complies with all other App Store Review Guidelines.
Apple claimed it could not run BlueMail on the Catalina version of macOS, and that it did not have any way to run Mojave or other operating systems. This is hard to believe – and it is also irrelevant.
Apple kicked BlueMail out of the Mac App Store before Catalina was even released. Catalina compatibility had nothing to do with the removal. In any event, BlueMail does run on Catalina, as we have shown Apple, and no notarization is required for apps distributed through the Mac App Store, as Apple has now admitted.
Even if BlueMail did not run on Catalina, many applications on the Mac App Store do not run on Catalina – including apps submitted when we submitted BlueMail, which Apple approved with no problem.
More details
Until June 7, 2019, the day Apple kicked BlueMail out of the store, BlueMail was live on the Mac App Store. macOS Catalina was released on October 7, 2019.
We asked a senior manager on Apple’s App Review team to run BlueMail on macOS Mojave, the latest version of macOS available when BlueMail was submitted. The team refused, claiming it could not locate a Mojave machine anywhere within Apple.
BlueMail runs on macOS Catalina, in our lab and outside of it.