• Blix, which has filed a lawsuit against Apple in the past accusing it of infringing on its technology, says Apple delayed approving an update to its BlueMail app for weeks.
• According to emails reviewed by Business Insider, Apple rejected Blix’s app update for not including Apple’s “Sign in with Apple” feature, a requirement for apps that offer a sign in option from another service.
• Since Blix is an email app, it should have been exempt from that rule. 
• The interaction comes as some developers have been at odds with Apple over its policies, such as its requirement that app makers use Apple’s in-app payment feature.
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The company behind the popular email app BlueMail says Apple stonewalled its app updates after it criticized the iPhone maker. 

In emails reviewed by Business Insider, Apple tells the developer, Blix, that it had rejected its app updates