ActiveSync devices are not able to send e-mails sporadically. E-mails with attachment and long conversation history.
IPhone Error “Message cannot be sent” , “The message was rejected from the server”
Browsed to configuration editor of IIS ->Microsoft-Server-ActiveSync Virtual Directory -> select ConfigurationEditor -> system.webServer -> serverRuntime -> uploadReadAheadSize.
Change value to 15728640
Recycle MSExchange ActiveSync AppPool.
- The maxRequestEntityAllowedand uploadReadAheadSize attributes respectively configure limits for the maximum number of bytes allowed in the entity body of a request and the number of bytes a Web server will read into a buffer and pass to an ISAPI extension.