I'm trying to setup the e-mail service on CMR using a Gmail account, but I've stuck in the CA file upload. Gmail uses GTS Root R1 certificate for SMTP services and it's available to downoad in PEM and DER formats, but none of these can be uploaded to CMR, which returns "The transferred certificate file is invalid." 

Whats is the file format that is suposed to be uploaded to the device?

Murillo Gumiero